作业帮-(3a²-4ab)+[a²-2(2a+2ab)],其中(a+2)²+|b-1|=0先化简再求值
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 22:57:19
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-(3a²-4ab)+[a²-2(2a+2ab)],其中(a+2)²+|b-1|=0先化简再求值
-(3a²-4ab)+[a²-2(2a+2ab)],其中(a+2)²+|b-1|=0
先化简再求值
-(3a²-4ab)+[a²-2(2a+2ab)],其中(a+2)²+|b-1|=0先化简再求值
(a+2)²+|b-1|=0
则a+2=0,b-1=0
则a=-2,b=1
-(3a²-4ab)+[a²-2(2a+2ab)]
=-3a²+4ab+a²-4a-4ab
=-2a²-4a
=-2×4-4×(-2)
=0