若m^2+mn=-3,n^2-3mn=18,则m^2+4mn-n^2的值为多少?急,
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若m^2+mn=-3,n^2-3mn=18,则m^2+4mn-n^2的值为多少?急,
若m^2+mn=-3,n^2-3mn=18,则m^2+4mn-n^2的值为多少?急,
若m^2+mn=-3,n^2-3mn=18,则m^2+4mn-n^2的值为多少?急,不好意思```没纸了```求采纳
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