x-y=5,m+n=7求（y+m)-(x-n)的值

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x-y=5,m+n=7求（y+m)-(x-n)的值
x-y=5,m+n=7求（y+m)-(x-n)的值

x-y=5,m+n=7求（y+m)-(x-n)的值
（y + m)-(x - n)
= y + m - x + n
= -(x - y) + (m + n)
= -5 + 7
= 2

（y+m)-(x-n)=y-x+m+n=-5+7=2

（y+m)-(x-n)=y+m-x+n=-(x-y)+(m+n)=-5+7=2

(y+m)-(x-n)
=y+m-x+n
=-(x-y)+m+n
=-5+7
=2

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