Số thích hợp  viết vào chỗ chấm để  45 m 2   6 c m 2   =   . . . . . . . . . . .   c m 2  là

A. 456

B. 4506

C. 456 000

D. 450 006

Cho khối chóp S.ABC có SA vuông góc với mặt đáy (ABC), tam giác ABC vuông cân tại B. SA = a , SB hợp với đáy một góc 300. Tính khoảng cách giữa AB và SC.

A. a 3 3

B.  a 3 6

C.  a 3 2

D.  a 3 4

Choose the sentences that are closest in meaning to the given sentence(s).Zoe had practiced a lot, so she was sure of her winning in the competition.

A. Practicing a lot, Zoe was sure of her winning in the competition.

B. To have practiced a lot, Zoe was sure of her winning in the competition.

C. Having been sure of her winning in the competition, Zoe practiced a lot.

D. Having practiced a lot, Zoe was sure of her winning in the competition

Phân số lớn nhất trong các phân số 3/4; 7/7; 3/2; 4/3 là

A. 3/4

B. 7/7

C. 3/2

D. 4/3

Choose the sentences that are closest in meaning to the given sentence(s).As he had drunk too much, he didn’t drive home himself.

A. Not to having drunk too much, he drove home himself

B. Not having driven home himself, he drank too much.

C. Having drunk too much, he didn’t drive home himself.

D. Drinking too much, he hadn’t driven home himself.

Một hình trụ có thiết diện qua trục là một hình vuông cạnh 2a. Thể tích khối trụ tương ứng bằng

A. 2 π a 3

B.  π a 3

C.  8 π a 3 3

D.  2 π a 3 3

Tính bằng cách thuận tiện nhất

a) 5 x 36 x 2

b) 127 + 1 + 73 + 39