已知m^2-mn=21,mn-n^2=-15,求m^2-2mn+n^2的值
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已知m^2-mn=21,mn-n^2=-15,求m^2-2mn+n^2的值
已知m^2-mn=21,mn-n^2=-15,求m^2-2mn+n^2的值
已知m^2-mn=21,mn-n^2=-15,求m^2-2mn+n^2的值
∵m^2-mn=21,mn-n^2=-15
∴ m^2-mn-(mn-n^2﹚=21-﹙-15﹚
∴m^2-2mn+n^2=36
已知m^2-mn=21,mn-n^2=-15,
m^2-2mn+n^2的值
=(m^2-mn)-(mn-n^2)
=21-(-15)
=21+15
=36
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