若(m+n)(m-n)²-mn(m+n)=(m+n)×M ,则M的值是?
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若(m+n)(m-n)²-mn(m+n)=(m+n)×M ,则M的值是?
若(m+n)(m-n)²-mn(m+n)=(m+n)×M ,则M的值是?
若(m+n)(m-n)²-mn(m+n)=(m+n)×M ,则M的值是?
你好!
(m+n)(m-n)²-mn(m+n)
= (m+n) [ (m-n)²-mn ]
∴M = (m-n)²-mn = m² - 3mn + n²