已知2x+y=0,求x-2y/x^2+xy乘以x^2-y^2除以x^2-4xy+4y^2/x的值.
已知2x+y=0,求x-2y/x^2+xy乘以x^2-y^2除以x^2-4xy+4y^2/x的值.
已知2x+y=0,求x-2y/x^2+xy 乘以 x^2-y^2 除以 x^2-4xy+4y^2/x的值.
已知2x+y=0,求x-2y/x^2+xy 乘以 x^2-y^2 除以 x^2-4xy+4y^2/x的值.
數學人氣:899 ℃時間:2019-11-07 17:05:49
優(yōu)質解答
〔(x-2y)/(x^2+xy)〕 *〔( x^2-y^2) /(x^2-4xy+4y^2)/x〕=〔(x-2y)/x(x+y)〕 *〔( x+y)(x-y) /(x-2y)^2/x〕=〔(x-2y)/x(x+y)〕 *〔( x+y)(x-y) /(x-2y)^2/x〕=(x-y)/(x-2y)由2x+y=0可得:y=-2x把y=-2x代...
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