1. Don't make noise, Sam-------to study his English test. A. tries B. try C. tried D. is trying
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2. The streets are getting more and …… these days. A. crowded B. less crowded C. more crowded D. most crowded
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3. When he failed ------ us, we left without him A. to meet B. to be met C. not to meet D. not to be met
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4. Peter has been trying for an hour, but his car still -------start A. didn't B. wouldn't C. hasn't D. won't
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5. Mrs. Lewis then stood up and said a few words ------- to the visitors A. to welcome B. of welcome C. of welcomes D. for welcoming
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6. Try again. Don't give ------ hope A. out B. in C. about D. up
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7. The book describes adventures that happened------- A. at a long time B. in a very old C. a long time ago D. an old time ago
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8. Students should answer seven of the -------ten questions A. below B. following C. under D. added
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9. Which sister is -------, Kate or Jenny A. more taller B. tall C. taller D. is tallest
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10. Tell Chris ------- outside A. goes B. for not going C. not go D. not to go |
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sau khi chuyển thì đơn vị 1 có số người là:
(70+6):2=38(người)
sau khi chuyển thì đơn vị 2 có số người là:
70-38=32(người)
vì 2 đơn vị có số người bằng nhau nên lúc đầu mỗi đơn vị có 35 số người .
vậy mỗi đơn vị có 35 người.
a) 5 ; x+y ;2xy đồng dạng với 4xy ;a (x) = 25x + 2x2
b) -2xy
a) Ta có: \(2x^2y\cdot\left(-2.5x^3y^2z\right)\)
\(=\left(-2.5\cdot2\right)\cdot\left(x^2\cdot x^3\right)\cdot\left(y\cdot y^3\right)\cdot z\)
\(=-5x^5y^4z\)
a) Ta có: \(12x^5y^2\cdot\left(-12.5zx^2y^5z\right)\)
\(=\left(-12.5\cdot12\right)\cdot\left(x^5\cdot x^2\right)\cdot\left(y^2\cdot y^5\right)\cdot z^2\)
\(=-150x^7y^7z^2\)
a, P=-3(x^3.x)(y^2.y^3)
=-3x^4y^5
b, Thay x=-1 , y=2 vào đơn thức P . Ta có :
P=-3.(-1)^4.2^5
P=3.1.32
P=96
1. Don't make noise, Sam-------to study his English test.
A. tries B. try C. tried D. is trying2. The streets are getting more and …… these days.
3. When he failed ------ us, we left without him
4. Peter has been trying for an hour, but his car still ------- start
5. Mrs. Lewis then stood up and said a few words ------- to the visitors
6. Try again. Don't give ------ hope
7. The book describes adventures that happened-------
8. Students should answer seven of the -------ten questions
9. Which sister is -------, Kate or Jenny
10. Tell Chris ------- outside