已知x^my^n与5x²y³的和是单项式,[x^m表示x的m次方]
m=2,
n=3,
m³-7m²n+n³+4m²n-5m+3m²n
=m³+4m²n+n³
=2³+4*2²*3+3³
=8+48+27
=83.
已知xmyn与5x2y3的和是单项式,求m3-7m2n+n3+4m2n-5m+3m2n的值.
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