tìm x x+17=2.|x|-39 x.(x+3)=0 -12(x-5)+7(3-x)=5 (x+1)(x^2+1)=0

Cho tam giác ABC vuông tại A có góc B = 60, AB = a Tính tích vô hướng AC.CB Làm ntn có sai ko: Có tan(60) = AC /AB => AC= a√(3) Áp dụng định lí Pi-ta-go trong tam giác ABC ta có: BC^2=AC^2 + AB^2 => BC=2a Lại có: tishc vô hướng AC.CB = AC^2 + BC^2 - AB^2 / 2 = 3a^2

Mot hinh thang vuong co dien tich 120cm2. Hieu 2 day la 6cm, canh ben khong vuong goc voi day co do dai 10cm. Day be =2/3 day lon. Tinh chu vi hinh thang. Thanks

Những việc làm để có sức khỏe tốt

Bài 2: hòa tan hoàn toàn a gam kim loại M chưa biết hóa trị vào dd HCl 3,65% . Sau phản ứng thu được d d muối có nồng độ 6,18%. ( biện luận hóa trị của kim loại thường từ 1 đến 3).

. Use the given words to write the complete conditional sentences type 2. 1. If/I/ be/ you/I/ eat/ more vegetable. ____________________________________________________________________ 2. More/ foreign tourist/ come/ here/ if/ environment/ clean. ____________________________________________________________________ 3. What/ happen/ if/ there/ be/ no woman/ world? ____________________________________________________ 4. If/I/ be/ his father/I/ ask/ him/ learn English/ better. ____________________________________________________________________ 5. If/ there/ be/ no war/ earth/ people/ live/ peace/ forever. ____________________________________________________________________ 6. Flood/ not happen/ so regularly/ if/ people/ not cut down/ so many/ tree. ____________________________________________________________________ 7. If/ they/ tell/ their father/ he/ be/ very angry. ____________________________________________________________________ 8. She/ spend/ a year/ USA/ if/ it/ be/ easy/ get/ green card. ____________________________________________________________________ 9. If/I/ live/ lonely island/I/ be/ very sad all day. ____________________________________________________________________ 10. My brother/ buy/ sport car/ if/ he/ have/ money. ____________________________________________________________________ II. Finish each of the following sentences so that its meaning stays the same. 1. Richard is too young to see the horror film. → Richard is not _________________________________________________ 2. Remember to turn off the fan before leaving the room. → Don't ________________________________________________________ 3. That man is very intelligent. → What ________________________________________________________ 4. I intended to come over to pick you up. → I was ________________________________________________________ 5. My sister's hair is long and black. → My sister has __________________________________________________ 6. The supermarket is near Trung's house. → The supermarket isn't ___________________________________________ 7. Alexander G. Bell invented the telephone in 1876. → Alexander G. Bell was __________________________________________ 8. I'll phone you tomorrow morning. → I’ll give ______________________________________________________ 9. How about going to the theatre tonight. → Let's _________________________________________________________ 10. She lived on a farm once, but she doesn't any more. → She used______________________________________________________

Một bệ pháo có khối lượng 1500kg bắn một viên đạn có khối lượng 5kg với vận tốc khi ra khỏi nòng là 600m/s . Tính vận tốc giật lùi của bệ pháo trong hai trường hợp a, Đạn được bắn theo phương ngang b, Đạn được bắn theo phương hợp với phương ngang một góc 60 độ

điền vào chỗ trống :My mother is a good (1)__________ and she can make a lot of delicious dishes. She also (2) ………………….. brother and me how to cook. Now we can make different Vietnamese dishes (3)__________ as fried beef, spring rolls, vegetable soup, pho, etc. In addition, we've learnt how to make pizza, lasagne, sushi, and curry. My brother's (4__________ dish is lasagne while I like pho and spring rolls the (5) __________. At the moment, my mother is teaching us how to bake. My mother has very good eating (6) __________. For breakfast, she usually has a bowl of rice, some lean chicken or pork, a plate of vegetables, and a banana. She never (7)__________ this important meal. For lunch, she has different types of salad, some fish, and some rice. She doesn't eat (8) __________ for dinner, just some vegetables and lean meat She encourages us to (9) __________ healthily by avoiding fast foods and soft drinks. In addition, every morning, we get up early to do (10) __________ together. It's a good way to keep fit, isn't it?

phân tử hợp chất A có hai nguyên tố.Khi đốt 7g chất A thu dc 9g nước.Xác định công thức phân tử của A,bít khối lượng phân tử của A là 70g

Chứng minh rằng P = 2!/3!+ 2!/4! + 2!/5! + ...+ 2!/n! < 1( n thuộc N và n lớn hơn hoặc bằng 3).