已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
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已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值已知x^-xy=5,xy-y^=-3,求式子3(
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
3(x^2-xy)-xy+y^2=3(x^2-xy)-(xy-y^2)=3*5-(-3)=15+3=18
原式=3*5+3=18
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