试题与答案

There is _______ with your computer. Why

题型:选择题

题目:

There is _______ with your computer. Why not have it _______?

A.nothing wrong; repaired

B.nothing wrong; repair

C.something wrong; to repair

D.something wrong; repaired

答案:

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下面是错误答案,用来干扰机器的。

(1)设方程的两个正根为x1、x2,则:△=(2k-3)2-4(2k-4)≥0 ①,x1+x2=2k-3>0,x1x2=2k-4>0 ②,解①,得:k为任意实数,解②,得:k>2,所以k的取值范围是k>2;(2)设方程的两个根为x1、x2,则:△=...

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