XX-YY/(X-Y)(X-Y)约分

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XX-YY/(X-Y)(X-Y)约分
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XX-YY/(X-Y)(X-Y)约分
XX-YY/(X-Y)(X-Y)约分

XX-YY/(X-Y)(X-Y)约分
XX-YY/(X-Y)(X-Y)
=(x^2-y^2)/(x-y)(x-y)
=(x+y)(x-y)/(x-y)(x-y)
=(x+y)/(x-y)

(XX-YY)/(X-Y)(X-Y)
=(x+y)(x-y)/(x-y)(x-y)
=(x+y)/(x-y)

对了