已知(m-1)^2+|3m-2n|=0,求(4m^2-mn+6n^2)-2(m^2-3mn+5n^2)的值
2个回答
因为 (m-1)^2+|3m-2n|=0
所以(m-1)^2=0;|3m-2n|=0
解得m=1,n=1.5
带入下式解的得
(4m^2-mn+6n^2)-2(m^2-3mn+5n^2)=0.5
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