解方程组2/(x+y)-1/(x-y)=3 3/(x+y)+4/(x-y)=10,设1/(x+y)=m,1/(x-y)=n,将原方程化为2m-n=3,3m+4n=10,解得m=2,n=1.∴原方程组的解为x=3/4,y=-(1/4).请用这种方法解(x+y)/2+(x-y)/3=7 (x+y)/3-(x-y)/4=-1
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