bài 1 cmr (a+c)(a-c)b(2a-b)-(a-b+c)(a-b-c) =0 cái này các bn chứng minh vế trái hộ mình nha

Ai đã học bài 1 Địa Lý lớp 7 rồi thì chụp lại vở cho mình với . Mình cảm ơn

Giúp mình tìm x thuộc Q `x+54+(-7^(2))-(-2x)^(2)=0`

viết một đoạn văn 5-7 câu giới thiệu về bản thân mình(trong đó có 5 từ ghép,2 từ láy)

Tính số mol và khối lượng chất tan có trong dung dịch a. 200ml dd HCl có pH=1 b. 300ml dd H2SO4 có pH=2 c. 100ml dd NaOH có pH=13 d. 250ml dd Ba(OH)2 có pH=12

I.Choose the correct answer to complete each following sentences. 1.Nam used to ________ morning exercise when he got up early. A. did B. does C. doing D. do 2. My father __________the bus to work every day, but I cycle. A. catches B. drives C. goes D. runs 3. I go to school __________ bike. A. by B. on C. in D. from 4. She’s sure that they will find the film_________. A. entertaining B. entertain C. entertainment D. entertained 5. __________ the story of the film was good, I didn’t like the acting. A. Because B. Since C. As D. Although 6. ____________ is La Tomatina celebrated? – Every August. A. Where B. Why C. When D. Which 7.The boys _______ home for lunch because they are planning to visit the hydro power station. A. have not come B. do not come C. will not be coming D. is not coming 8.They ___________ that we have gone without telling them. A. thought B. are thinking C. will be thinking D. think 9.At 7.00 tomorrow, you ___________ to school. A .cycle B. will cycle C. will be cycling D. will be cycled 10. Solar energy will ________ to solve the problem of energy shortage. A. use B. be used C. used D. using II. Put the correct form of the verb in brackets. (Chia dạng đúng của động từ trong ngoặc ) 1.Nam often ( play) ________________________ soccer in the afternoon. 2.My father used to (go) _____________________swimming when he was a child. 3. He (live)________________ in Da Nang since 1980. 4. What_____________we (do ) _________________ to save electricity ,dad ? We will watch less TV. 5.At 5 o’clock tomorrow Nam ( play) ____________________football with his friends. III. Read the text and choose the best answers. SAFETY TIPS FOR BUS PASSENGERS Always maintain a queue while waiting (1)______ a bus. Never stand on queue on the middle of the road. At the time of boarding a bus do not try to run or chase the bus. Once you are inside the bus, (2)______ a seat and hold firmly on the handrail if you are standing. Never try to (3)______ an overcrowded bus. Avoid (4)______ inside of a bus because your high-pitch noise may distract the attention of the driver and it could lead to a major (5)______ accident. 1.A.for B.to C.on D.in 2.A.hold B.sit C.take D.find 3.A.choose B.go C.wait D.board 4.A.shout B.shouting C.to shout D.shouts 5.A.road B.way C.path D.street IV. Complete each sentence so it means the same as the sentence above. ( Viết lại câu sao cho nghĩa của câu không đổi ) 1. The distance from Ha Noi to Thanh Hoa City is about 100 kilometres. 🡪 It is about…………………................................................................................. 2. Although he is so young , he plays football beautifully. 🡪Despite ...................................................................................................................... 3.My father lived in small village when he was a child. 🡪 My father used to …………………………………………..………………..…….. 4. What is the distance between Thanh Hoa and Ha Noi city? 🡪How far……………………………………………………………………….….? 5. We will use less electricity in the future 🡪 Less electricity ………………….………………………………………………… V. Rearrange the words to make meaningful sentences. ( 3 points) 1. Solar energy/ in the world/ by many countries/ will be used/. 🡪…………………………………..…………….……………………………… 2. to another/ How/ you travel from / will/ one place/? 🡪 ……… ……………………………..…………..……………………………… 3. to save/ will reduce/ our energy/ the use of electricity/ We/. 🡪………………….… ………………………………………………..………………

I.Choose the correct answer to complete each following sentences. 1.Nam used to ________ morning exercise when he got up early. A. did B. does C. doing D. do 2. My father __________the bus to work every day, but I cycle. A. catches B. drives C. goes D. runs 3. I go to school __________ bike. A. by B. on C. in D. from 4. She’s sure that they will find the film_________. A. entertaining B. entertain C. entertainment D. entertained 5. __________ the story of the film was good, I didn’t like the acting. A. Because B. Since C. As D. Although 6. ____________ is La Tomatina celebrated? – Every August. A. Where B. Why C. When D. Which 7.The boys _______ home for lunch because they are planning to visit the hydro power station. A. have not come B. do not come C. will not be coming D. is not coming 8.They ___________ that we have gone without telling them. A. thought B. are thinking C. will be thinking D. think 9.At 7.00 tomorrow, you ___________ to school. A .cycle B. will cycle C. will be cycling D. will be cycled 10. Solar energy will ________ to solve the problem of energy shortage. A. use B. be used C. used D. using II. Put the correct form of the verb in brackets. (Chia dạng đúng của động từ trong ngoặc ) 1.Nam often ( play) ________________________ soccer in the afternoon. 2.My father used to (go) _____________________swimming when he was a child. 3. He (live)________________ in Da Nang since 1980. 4. What_____________we (do ) _________________ to save electricity ,dad ? We will watch less TV. 5.At 5 o’clock tomorrow Nam ( play) ____________________football with his friends. III. Read the text and choose the best answers. SAFETY TIPS FOR BUS PASSENGERS Always maintain a queue while waiting (1)______ a bus. Never stand on queue on the middle of the road. At the time of boarding a bus do not try to run or chase the bus. Once you are inside the bus, (2)______ a seat and hold firmly on the handrail if you are standing. Never try to (3)______ an overcrowded bus. Avoid (4)______ inside of a bus because your high-pitch noise may distract the attention of the driver and it could lead to a major (5)______ accident. 1.A.for B.to C.on D.in 2.A.hold B.sit C.take D.find 3.A.choose B.go C.wait D.board 4.A.shout B.shouting C.to shout D.shouts 5.A.road B.way C.path D.street IV. Complete each sentence so it means the same as the sentence above. ( Viết lại câu sao cho nghĩa của câu không đổi ) 1. The distance from Ha Noi to Thanh Hoa City is about 100 kilometres. 🡪 It is about…………………................................................................................. 2. Although he is so young , he plays football beautifully. 🡪Despite ...................................................................................................................... 3.My father lived in small village when he was a child. 🡪 My father used to …………………………………………..………………..…….. 4. What is the distance between Thanh Hoa and Ha Noi city? 🡪How far……………………………………………………………………….….? 5. We will use less electricity in the future 🡪 Less electricity ………………….………………………………………………… V. Rearrange the words to make meaningful sentences. ( 3 points) 1. Solar energy/ in the world/ by many countries/ will be used/. 🡪…………………………………..…………….……………………………… 2. to another/ How/ you travel from / will/ one place/? 🡪 ……… ……………………………..…………..……………………………… 3. to save/ will reduce/ our energy/ the use of electricity/ We/. 🡪………………….… ………………………………………………..………………

x + 5/2 x 2/3 = 52 Help me pleaseeeeeeeeeee

cho hỏi nè : giải phương trình sau : x - y = -1 và 2/x + 3/y= 2 Giúp mình nha ~!

I.Choose the correct answer to complete each following sentences. 1.Nam used to ________ morning exercise when he got up early. A. did B. does C. doing D. do 2. My father __________the bus to work every day, but I cycle. A. catches B. drives C. goes D. runs 3. I go to school __________ bike. A. by B. on C. in D. from 4. She’s sure that they will find the film_________. A. entertaining B. entertain C. entertainment D. entertained 5. __________ the story of the film was good, I didn’t like the acting. A. Because B. Since C. As D. Although 6. ____________ is La Tomatina celebrated? – Every August. A. Where B. Why C. When D. Which 7.The boys _______ home for lunch because they are planning to visit the hydro power station. A. have not come B. do not come C. will not be coming D. is not coming 8.They ___________ that we have gone without telling them. A. thought B. are thinking C. will be thinking D. think 9.At 7.00 tomorrow, you ___________ to school. A .cycle B. will cycle C. will be cycling D. will be cycled 10. Solar energy will ________ to solve the problem of energy shortage. A. use B. be used C. used D. using II. Put the correct form of the verb in brackets. (Chia dạng đúng của động từ trong ngoặc ) 1.Nam often ( play) ________________________ soccer in the afternoon. 2.My father used to (go) _____________________swimming when he was a child. 3. He (live)________________ in Da Nang since 1980. 4. What_____________we (do ) _________________ to save electricity ,dad ? We will watch less TV. 5.At 5 o’clock tomorrow Nam ( play) ____________________football with his friends. III. Read the text and choose the best answers. SAFETY TIPS FOR BUS PASSENGERS Always maintain a queue while waiting (1)______ a bus. Never stand on queue on the middle of the road. At the time of boarding a bus do not try to run or chase the bus. Once you are inside the bus, (2)______ a seat and hold firmly on the handrail if you are standing. Never try to (3)______ an overcrowded bus. Avoid (4)______ inside of a bus because your high-pitch noise may distract the attention of the driver and it could lead to a major (5)______ accident. 1.A.for B.to C.on D.in 2.A.hold B.sit C.take D.find 3.A.choose B.go C.wait D.board 4.A.shout B.shouting C.to shout D.shouts 5.A.road B.way C.path D.street IV. Complete each sentence so it means the same as the sentence above. ( Viết lại câu sao cho nghĩa của câu không đổi ) 1. The distance from Ha Noi to Thanh Hoa City is about 100 kilometres. 🡪 It is about…………………................................................................................. 2. Although he is so young , he plays football beautifully. 🡪Despite ...................................................................................................................... 3.My father lived in small village when he was a child. 🡪 My father used to …………………………………………..………………..…….. 4. What is the distance between Thanh Hoa and Ha Noi city? 🡪How far……………………………………………………………………….….? 5. We will use less electricity in the future 🡪 Less electricity ………………….………………………………………………… V. Rearrange the words to make meaningful sentences. ( 3 points) 1. Solar energy/ in the world/ by many countries/ will be used/. 🡪…………………………………..…………….……………………………… 2. to another/ How/ you travel from / will/ one place/? 🡪 ……… ……………………………..…………..……………………………… 3. to save/ will reduce/ our energy/ the use of electricity/ We/. 🡪………………….… ………………………………………………..………………