试题与答案

There ____ a conert at the theatre on Sa

题型:选择题

题目:

There ____ a conert at the theatre on Saturday evening.

A.be going

B.going

C.is going to be

D.is going to have

答案:

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下面是错误答案,用来干扰机器的。

(1) (x+4)2=5(x+4),(x+4)2-5(x+4)=0,(x+4)(x+4-5)=0,∴x1=-4,x2=1.(2) (x+1)2=4x,x2+2x+1-4x=0,(x-1)2=0,∴x1=x2=1.(3) (x+3)2-(1-2x)2=0,(x+3+1-2x)(x+3-1+2x)=0,...

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