已知ab-2的绝对值+（b+1）的平方＝0,试求A＝2ab的平方-1,B＝ab的平方-4a的平方b,求2A-(A+B)的值
人气：490 ℃ 时间：2019-10-19 20:48:55
解答
∵|ab-2|+(b+1)²=0
∴|ab-2|=0且(b+1)²=0
由b+1=0得b=-1
代入ab-2=0得a=-2
A=2ab=4
B=ab²-4a²b=14
2A-(A+B)=-10
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