GWD23-27,23-35

ruoshany

两道数学题 麻烦大家帮忙解答一下

Q35:

What is the greatest common factor of the positive integers j and k?

(1)     k = j + 1

(2)     jk is divisible by 5.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案为A

Q27:

If line k in the xy-plane has equation y = mx + b, where m and b are constants, what is the slope of k ?

(1)     k is parallel to the line with equation y = (1 – m)x + b + 1.

(2)     k intersects the line with equation y = 2x + 3 at the point (2, 7).

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案为A

yjz809

Q35 1) the greatest common factor of any two adjacent integers is 1

    2) can't decide

Q27 1) m = 1-m => m = 1/2

    2) can't decide from equation 7 = 2m +b