计算(一x一y)(x一y)+(x+y)^2
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计算(一x一y)(x一y)+(x+y)^2
计算(一x一y)(x一y)+(x+y)^2
计算(一x一y)(x一y)+(x+y)^2
=-(x+y)(x-y)+x^2+y^2+2xy
=-x^2+y^2+x^2+y^2+2xy
=2y(y+x)
计算(一x一y)(x一y)+(x+y)
计算(一x一y)(x一y)+(x+y)^2
计算(一x一y)(x一y)+(x+y)^2(^2表平方
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有一函数:y={x,x
有一函数:y=x (x
已知一函数y=x(x
有一函数:y={x,x
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2x一5y=一3 一4x十y=一3