Đáp án:
Giải thích các bước giải:
`-10x^2 + 11x +6`
`=-(10x^2-11x-6)`
`=-(10x^2-15x+4x-6)`
`=-[5x(2x-3)+2(2x-3)]`
`=-(2x-3)(5x+2)`
`abc+ab+bc+ca+a+b+c+1`
`=ab(c+1)+a(c+1)+b(c+1)+(c+1)`
`=(c+1)(ab+a+b+1)`
`=(c+1)[a(b+1)+(b+1)]`
`=(c+1)(b+1)(a+1)`
$@dragonkind$
`-10x^2+11x+6`
`=-10x^2+15x-4x+6`
`=(-10x^2+15x)-(4x-6)`
`=-5x(2x-3)-2(2x-3)`
`=-(5x+2)(2x-3)`
`=(abc+ab)+(bc+b)+(ca+a)+(c+1)`
`=ab(c+1)+b(c+1)+a(c+1)+(c+1)`
`=(ab+a+b+1)(c+1)`
`=[(ab+b)+(a+1)](c+1)`
`=[b(a+1)+(a+1)](c+1)`
`=(a+1)(b+1)(c+1)`
1. They like to travel to Nha Trang on their vacation. They enjoy _____________________________________________. 2. You should not watch TV too late. You ought _____________________________________________. 3. Nam will visit his grandparents tonight. Nam is ________________________________________________. 4. How much are these sweaters? How much ____________________________________________? 5. Lan Anh learns very hard Lan Anh is ____________________________________________
trên cùng 1 nữa mặt phẳng b chứa tia Ox, vẽ hai tia yO,Ot sao cho xÔy = 110 độ xÔt=50 độ a) so sánh góc xÔt và tÔy b) vẽ tia Ok là tia phân giác tÔy. tính số đo yÔk
1. Where..................you last Sunday? A. is B. was C. are D. were 2. ................did Lan go to the dentist’s last week? - Because she has a bad toothache. A. What B. Why C. When D. Where 3. How.................is Hoa? – She is 150cm. A. wide B. heavy C. tall D. weigh 4. Would you like ………to the movies with us tonight? A. to go B. go C. going D. goes 5. Are you interested..................taking care of yourself? A. on B. of C. in D. with 6. You should......................your hands before meals. A. wash B. washing C. to wash D. washes 7. She doesn't like pork and _________does her uncle. A. so B. neither C. too D. either 8. Hoa is learning...............a sewing machine A. to use B. what to use C. how using D. how to use 9. My mother always drives _________. A. careful B. slow C. carefully D. careless 10. Where ……….you …….. on vacation last year? A. do, did B. were, go C. did, went D. did, go
tìm số nguyên a sao cho câu a -3/4<a/12<-5/9 câu b -5/6<a/5<1/2 GIÚP MÌNH VỚI
Viết 1 lá thư cho bạn kể về chuyến camping trên núi, mọi người hộ e với ạ, viết thư nha
Bài 1 : 66.25 + 5.66 + 66.14 + 33.66 48.19 + 48.115 +134.52 Bài 2 : S6 = 15+25+35+... +115 S7 = 24+25+26+... +125 +126
D. WRITING I. Finish the second sentence so that it has the same meaning as the first. ( 1.5 pts) 1.The distance from Ho Chi Minh city to Phu Quoc Island is about 300 km. It is ………………………………………………………………………………….…………… 2. Road users should obey traffic rules strictly. Traffic rules ……………………………………………………………………………..……… 3. We will use less electricity in the future. Less electricity ………………………………………………………………………………….. important/ interesting/ use/ libraries/ problems/ see 4. Despite the heavy rain, the children still went to school on time. Although it ………….………………………………………………………………………….. 5. Mr Hai didn’t go to work yesterday because of his sickness. Because Mr Hai ............................................................................................................................. 6. They like to travel to Nha Trang on their vacation. They enjoy ………………………………………………………………………………………. II. Rearrange the words to make meaningful sentences.(0.5 pts) 1. this time tomorrow/ English/ They/ will/ be learning. ……………………………………………………………………………………………………. 2. people/ until/ flying cars/ use/ won’t/ year 2050. …………………………………………………………………………………………………….
Bài 1: tìm từ có cách phát âm khác ở phần gạch chân : 1. A. rack B. snack C. class D. many ( gạch chân chữ a) 2. A. shelf B. help C. left D. student ( gạch chân chữ e) 3. A. break B. read C. leave D. each ( gạch chân chữ ea) 4. A. door B. room C. book D. look( gạch chân chữ oo) 5. A. any B. have C. take C. back ( gạch chân chữ a) Bài 2: tìm từ có cách đánh trọng âm khác các từ còn lại trong mỗi dòng sau: 6. A. biology B. area C. author D. novel 7. A . receive B. physic C. order D. science 8. A. reader B. middle C. people D. cafeteria 9. A. uniform B. education C. dictionary D. chemistry 10. A. contain B. million C. reference D. welcome
tìm x thuộc Z để Q (x) = x-2/x-3 có giá trị là số nguyên
IV. Supply the correct forms of the verbs in brackets. 1. He (wash)………………………….the dishes everyday. 2. We (visit)………………………….Ha Long Bay next summer. 3. She (not watch) ………………………….TV last night. 4. ……… they (go) ………………………….to school now? V. Complete the second sentence so that it has a similar meaning to the first one. 1. Let’s go to the movies. What about …………….………………………………………………………………? 2. I like watching TV better than playing video games. I prefer…………………………………………………………………………………… 3. Mrs Mai is a good English teacher. Mrs Mai teaches………………………………………………………………………… 4. I spend two hours doing my washing every day. It takes………………………………………………………………………………
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