已知m^2-mn=20,mn-n^2=-12,求正式m^2-n^2与m^2-2mn+n^2的值!(请说明原因!)
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已知m^2-mn=20,mn-n^2=-12,求正式m^2-n^2与m^2-2mn+n^2的值!(请说明原因!)
![已知m^2-mn=20,mn-n^2=-12,求正式m^2-n^2与m^2-2mn+n^2的值!(请说明原因!)](/uploads/image/z/6496438-22-8.jpg?t=%E5%B7%B2%E7%9F%A5m%5E2-mn%3D20%2Cmn-n%5E2%3D-12%2C%E6%B1%82%E6%AD%A3%E5%BC%8Fm%5E2-n%5E2%E4%B8%8Em%5E2-2mn%2Bn%5E2%E7%9A%84%E5%80%BC%21%28%E8%AF%B7%E8%AF%B4%E6%98%8E%E5%8E%9F%E5%9B%A0%21%29)
m^2-mn=20
mn-n^2=-12
两式相加得
m^2-n^2=20-12=8
m^2-mn=20
mn-n^2=-12
两式相减得
m^2-2mn+n^2=20+12=32
mn-n^2=-12
两式相加得
m^2-n^2=20-12=8
m^2-mn=20
mn-n^2=-12
两式相减得
m^2-2mn+n^2=20+12=32
已知m^2-mn=20,mn-n^2=-12,求正式m^2-n^2与m^2-2mn+n^2的值!(请说明原因!)
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