由方程组3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知,x+y等于?x-y等于?x为?y为?

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由方程组3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知,x+y等于?x-y等于?x为?y为?由方程组3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知,x+y等

由方程组3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知,x+y等于?x-y等于?x为?y为?
由方程组3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知,x+y等于?x-y等于?x为?y为?

由方程组3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知,x+y等于?x-y等于?x为?y为?