SAT数学备考经典模拟题训练12

>>SAT数学模拟题：SAT数学备考经典模拟题训练12

>>SAT考试辅导

3. If pqr = 1 , rst = 0 , and spr = 0, which of the following must be zero?

A. P

B. Q

C. R

D. S

E. T

3.Correct Answer: D

Explanation:

If pqr = 1, none of these variable can be zero. Since spr = 0 , and since p and r are not zero, s must be zero. (Note that although rst = 0, and so either s or t must be zero, this is not sufficient to state which must be zero)

4.Correct Answer: E

Explanation:

65 = 64x 6

(64 x 6) - 64 = 64(6 - 1) = 64 x 5

Now, dividing by 5 will give us 64

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