x+y-1|+(x-y+3)²=0,则x²-y²=______.,结果好像是-3,但我不知
x+y-1|+(x-y+3)²=0,则x²-y²=______.,结果好像是-3,但我不知
|x+y-1|+(x-y+3)²=0,则x²+y²=______.,结果好像是-3,但我不
1、若|x-1|+(y+3)²=0,则x²+y²=
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方程组{x²+y²=10(1)x²-3xy+2y²=0(2)怎么解
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