mn(m-n)²-n(n-m)³=n(m-n)²( )
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mn(m-n)²-n(n-m)³=n(m-n)²( )
mn(m-n)²-n(n-m)³=n(m-n)²( )
mn(m-n)²-n(n-m)³=n(m-n)²( )
算错.= =括号里面是2m-n
mn(m-n)²-n(n-m)³
=n[m(m-n)²+(m-n)³]
=n(m-n)²( m+(m-n) )
不是m,因为是立方