Đáp án + Giải thích các bước giải:
`B=x^{3}-3x^{2}+3x`
`=(x^{3}-3x^{2}+3x-1)+1`
`=(x-1)^{3}+1`
Thay `x=11` vào biểu thức `B`, ta được :
`B=(11-1)^{3}+1=10^{3}+1=1000+1=1001`
Đáp án:
Giải thích các bước giải:
`B=x^3-3x^2+3x`
`B=x^3-3x^2+3x-1+1`
`B=(x-1)^3+1`
Thay `x=11` vào ta có:
`B=(11-1)^3+1`
`B=1000+1=1001`
Vậy khi `x=11` thì `B=1001`
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There are four people in my family. We (1. have) _______ different hobbies. My father (2. like)_______ playing badminton. He (3. play)______ it almost every day. My mother (4. not like) _________ this sport. She (5. enjoy) _______ walking. Every morning she (6. walk)______ for about two kilometres. Next year, I (7. join) _______ her. My younger sister (8. love) _____ reading books.There is a big bookshelf in her room. I (9. not like)_______ her books because they are usually picture books. She says she (10. read)_______ other kinds of books when she is older. (1) have (2) likes (3) plays (4) doesn’t like (5) enjoys (6) walks (7) will join (8) loves (9) don’t like (10) will read
Question 12. (NB) I don’t speak French and Sarah doesn't speak French, _____. A. either B. too C. so D. neither Question 13. (NB) Minh enjoys _______ a bike on the weekend. A. ride B. to ride C. rides D. riding Question 14. (NB) Last year, we ______ evening classes for fifty children. A. providing B. provided C. have provided D. to provide Question 15. (TH) Have you got ______ sandwiches in your fridge? A. some B. any C. a D. an Question 16. (TH) How ____ milk do you need for breakfast? A. far B. often C. many D. much Question 17. (TH) These people live in the countryside, _____ they enjoy the fresh air here. A. so B. or C. but D. and
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