已知2xmy2与-3xyn是同类项,求m_(m2n+3m_4n)+(2m2n-3n)的值.今天就要看到答案啊,

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已知2xmy2与-3xyn是同类项,求m_(m2n+3m_4n)+(2m2n-3n)的值.今天就要看到答案啊,已知2xmy2与-3xyn是同类项,求m_(m2n+3m_4n)+(2m2n-3n)的值.

已知2xmy2与-3xyn是同类项,求m_(m2n+3m_4n)+(2m2n-3n)的值.今天就要看到答案啊,
已知2xmy2与-3xyn是同类项,求m_(m2n+3m_4n)+(2m2n-3n)的值.
今天就要看到答案啊,

已知2xmy2与-3xyn是同类项,求m_(m2n+3m_4n)+(2m2n-3n)的值.今天就要看到答案啊,
∵2xmy2与-3xyn是同类项,
∴m=1,n=2,
∴m_(m2n+3m_4n)+(2m2n-3n)
=m-m2n-3m+4n+2m2n-3n
=m²n-2m+n
=1²×2-2×1+2
=2

∵2x^my^2与-3xy^n是同类项
∴m=1,n=2
∴m-(m²n+3m-4n)+(2m²n-3n)
=m-m²n-3m+4n+2m²n-3n
=m²n-2m+n
=1²×2-2×1-2=﹣2