已知x-y=6,a+b=-3则(a+y)-(x-b)=
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已知x-y=6,a+b=-3则(a+y)-(x-b)=已知x-y=6,a+b=-3则(a+y)-(x-b)=已知x-y=6,a+b=-3则(a+y)-(x-b)=x-y=6,a+b=-3∴(a+y)-
已知x-y=6,a+b=-3则(a+y)-(x-b)=
已知x-y=6,a+b=-3则(a+y)-(x-b)=
已知x-y=6,a+b=-3则(a+y)-(x-b)=
x-y=6,a+b=-3
∴(a+y)-(x-b)
=a+y-x+b
=(a+b)-(x-y)
=-3-6
=-9
-9
已知x-y=6,a+b=-3则(a+y)-(x-b)=
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