{3m-2n=11 4m+3n=9的解为m=3,n=-1,则由{3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知x+y=,x-y=,x=,y=
问题描述:
{3m-2n=11 4m+3n=9的解为m=3,n=-1,则由{3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知x+y=,x-y=,x=,y=
答
x+y=3
x-y=-1
x=1
y=2
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