解方程组:x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..
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解方程组:x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..
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X2y2-x2-y2+1 =x2(y2-1)-(y2-1) =(y2-1)(x2-1) =(y+1)(y-1)(x+1)(x-1) 中的=x2(y2-1)-(y2-1) =(y2-1)(x2-1是怎么算出来的?
已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2=