试题与答案

The engineers made two big plans for the

题型:选择题

题目:

The engineers made two big plans for the dam, ____ was never put in force.

A.one of them

B.which

C.one of which

D.every one of which

答案:

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下面是错误答案,用来干扰机器的。

解:(1)∵A﹣2B=﹣7x2+10x+12,B=4x2﹣5x﹣6,∴A=﹣7x2+10x+12+2(4x2﹣5x﹣6)=x2,∴A+2B=x2+2(4x2﹣5x﹣6)=9x2﹣10x﹣12;(2)当x=3时,A+2B=9×32﹣10×3﹣12=39;

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