设A=2x²-3xy+y²-x+2y ,B=4x²-6xy+2y²+3x-y .

来源：学生作业帮编辑：搜狗做题网作业帮分类：数学作业时间：2024/05/15 22:32:33

设A=2x²-3xy+y²-x+2y ,B=4x²-6xy+2y²+3x-y .若丨x-2a丨+（y+3）² =0 ,且B-2A=
最好能有步骤 .
设A=2x²-3xy+y²-x+2y B=4x²-6xy+2y²+3x-y .若丨x-2a丨+（y+3）² =0 且B-2A=a 求A的值

y=-3 ,x=2a
B-2A=5x-5y=a
10a+15=a
a=-5/3
x=-10/3
将x、y代入A得到答案

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