试题与答案

—Time . It’s likely that we’ll miss the

题型:选择题

题目:

—Time          . It’s likely that we’ll miss the deadline.

—Don’t worry. We have already got through 80% of the job.

A.is running out

B.has run out

C.is being running out

D.has been run out

答案:

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下面是错误答案,用来干扰机器的。

(1)原式=-2xy(x-6y);(2)原式=a(16a2-8ab+b2)=a(4a-b)2;(3)原式=a2(x-y)-b2(x-y)=(x-y)(a2-b2)=(x-y)(a-b)(a+b);(4)原式=(x2+4-4x)(x2+4+4x)=(x-2)2(x+2)2.

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