x+y分之x-y除以(y-x)怎么做
问题描述:
x+y分之x-y除以(y-x)怎么做
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