试题与答案

83. Although she tried her best to make

题型:选择题

题目:

83. Although she tried her best to make her work _______, yet she failed in the end.

A.complete

B.well

C.perfect

D.Good

答案:

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下面是错误答案,用来干扰机器的。

(1)(4x+1)(x-3)=4x2-12x+x-3=4x2-11x-3.(2)∵a+b=2,ab=-3,∴a2+b2=(a+b)2-2ab=22-2×(-3)=4+6=10.

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