判断正误并改正①(x+2)(x-3)/(2+x)(3-x)=-1②x+a/y+a=x/y③(x+y)-(x-y)/2(x
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判断正误并改正
①(x+2)(x-3)/(2+x)(3-x)=-1
②x+a/y+a=x/y
③(x+y)-(x-y)/2(x+y)(x-y)=二分之一
①(x+2)(x-3)/(2+x)(3-x)=-1
②x+a/y+a=x/y
③(x+y)-(x-y)/2(x+y)(x-y)=二分之一
![判断正误并改正①(x+2)(x-3)/(2+x)(3-x)=-1②x+a/y+a=x/y③(x+y)-(x-y)/2(x](/uploads/image/z/18734143-31-3.jpg?t=%E5%88%A4%E6%96%AD%E6%AD%A3%E8%AF%AF%E5%B9%B6%E6%94%B9%E6%AD%A3%E2%91%A0%EF%BC%88x%2B2%EF%BC%89%EF%BC%88x-3%EF%BC%89%2F%EF%BC%882%2Bx%EF%BC%89%EF%BC%883-x%EF%BC%89%3D-1%E2%91%A1x%2Ba%2Fy%2Ba%3Dx%2Fy%E2%91%A2%EF%BC%88x%2By%EF%BC%89-%EF%BC%88x-y%EF%BC%89%2F2%EF%BC%88x)
①(x+2)(x-3)/(2+x)(3-x)=-1
正确
②x+a/y+a=x/y
错误
因为约分必须整体约去
(x+a)/(y+a)已经是最简
③(x+y)-(x-y)/2(x+y)(x-y)=二分之一
错误
分子化简为2y
约分必须整体约去
(x+y)-(x-y)/2(x+y)(x-y)
=2y/2(x+y)(x-y)
=y/(x+y)(x-y)
正确
②x+a/y+a=x/y
错误
因为约分必须整体约去
(x+a)/(y+a)已经是最简
③(x+y)-(x-y)/2(x+y)(x-y)=二分之一
错误
分子化简为2y
约分必须整体约去
(x+y)-(x-y)/2(x+y)(x-y)
=2y/2(x+y)(x-y)
=y/(x+y)(x-y)
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