(5/3m²-2mn+n²)·(3m²n)

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(5/3m²-2mn+n²)·(3m²n)
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(5/3m²-2mn+n²)·(3m²n)
(5/3m²-2mn+n²)·(3m²n)

(5/3m²-2mn+n²)·(3m²n)
原式=5m^4n-6m³n²+3m²n³

原式=5m^4*n-6m^3*n^2+3m^2*n^2
直接把后面的乘进去就可以哦,

5/3m²*3m²n-2mn*3m²n+n²*3m²n=
5m4n-6m3n2+3m²n3