已知m^2-mn=21,mn-n^2=-15,求代数式:(1)m^2-n^2 (2)m^2-2mn+n^2
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![已知m^2-mn=21,mn-n^2=-15,求代数式:(1)m^2-n^2 (2)m^2-2mn+n^2](/uploads/image/z/97142-14-2.jpg?t=%E5%B7%B2%E7%9F%A5m%5E2-mn%3D21%2Cmn-n%5E2%3D-15%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%9A%EF%BC%881%EF%BC%89m%5E2-n%5E2+%282%29m%5E2-2mn%2Bn%5E2)
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已知m^2-mn=21,mn-n^2=-15,求代数式:(1)m^2-n^2 (2)m^2-2mn+n^2
已知m^2-mn=21,mn-n^2=-15,求代数式:
(1)m^2-n^2 (2)m^2-2mn+n^2
已知m^2-mn=21,mn-n^2=-15,求代数式:(1)m^2-n^2 (2)m^2-2mn+n^2
m^2-mn=21.①
mn-n^2=-15.②
①+②得
m^2-n^2=6
①+②得
m^2-2mn+n^2=36
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