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.