已知m^2-mn=21,mn-n^2= -15,(1)则m^2-n^2=?(2)m^2-2mn+n^2=?(说出原因)
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已知m^2-mn=21,mn-n^2= -15,(1)则m^2-n^2=?(2)m^2-2mn+n^2=?(说出原因)
![已知m^2-mn=21,mn-n^2= -15,(1)则m^2-n^2=?(2)m^2-2mn+n^2=?(说出原因)](/uploads/image/z/18463838-14-8.jpg?t=%E5%B7%B2%E7%9F%A5m%5E2-mn%3D21%2Cmn-n%5E2%3D+-15%2C%281%29%E5%88%99m%5E2-n%5E2%3D%3F%282%29m%5E2-2mn%2Bn%5E2%3D%3F%EF%BC%88%E8%AF%B4%E5%87%BA%E5%8E%9F%E5%9B%A0%EF%BC%89)
m^2-n^2=m^2-mn+mn-n^2=21+(-15)=6
m^2-2mn+n^2=m^2-mn=21-(mn-n^2)= 21-(-15)=36
m^2-2mn+n^2=m^2-mn=21-(mn-n^2)= 21-(-15)=36
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