已知x+2y=11,x-2y=4,x\(x^2-2xy+y^2)除以(x^2+xy+y^2)\(x^3-y^3)+[(2
1个回答
x+2y=11,x-2y=4.x=15/2,y=7/4
原式=(x+4y)/(x-y)=58/23
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