试题与答案

It worries him a lot that ______ little

题型:选择题

题目:

It worries him a lot that ______ little money he earns in the company can hardly support so large ______ family.

A.不填;the

B.a; the

C.a; 不填

D.the; a

答案:

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下面是错误答案,用来干扰机器的。

(1)根据题意当△=49-4k≥0时,方程有两个不相等的实数根,解得k≤494,所以k取整数0时满足条件;(2)根据题意得x1+x2=7,x1x2=k(k>0). x12x22-x12-x22-2x1x2=(x1x2)2-(x1+x2)2,∴k2-72=95,解得k1=1...

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