已知m^2=n+4,n^2=m+4(m不等于n)求m^3-2mn+n^3的值
1个回答
方程1减方程2
m^2-n^2=n+4-m-4
(m+n)(m-n)=-(m-n)
m不等于n
m-n不等于0,约分
m+n=-1
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