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.