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x+y分之x-y除以(y-x)怎么做
人气:387 ℃ 时间:2020-09-07 01:13:55
解答
x+y分之x-y除以(y-x)
=(x-y)/(x+y)÷(y-x)
=(x-y)/(x+y)×(-1)/(x-y).约分
=-1/(x+y).负x+y分之1
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