已知m^2-mn=20,m-n^2=-12求代数式m-n^2与m^2-2mn+n^2的值

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已知m^2-mn=20,m-n^2=-12求代数式m-n^2与m^2-2mn+n^2的值已知m^2-mn=20,m-n^2=-12求代数式m-n^2与m^2-2mn+n^2的值已知m^2-mn=20,

已知m^2-mn=20,m-n^2=-12求代数式m-n^2与m^2-2mn+n^2的值
已知m^2-mn=20,m-n^2=-12
求代数式m-n^2与m^2-2mn+n^2的值

已知m^2-mn=20,m-n^2=-12求代数式m-n^2与m^2-2mn+n^2的值
m^2-mn=20,mn-n^2=-12
m^2-n^2
=(m^2-mn)+(mn-n^2)
=20+(-12)
=8
m^2-2mn+n^2
=(m^2-mn)-(mn-n^2)
=20-(-12)
=32
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