化简2(4m^2n^2-3n^3)+5(-3m^2n^2+4n^3)
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化简2(4m^2n^2-3n^3)+5(-3m^2n^2+4n^3)
化简2(4m^2n^2-3n^3)+5(-3m^2n^2+4n^3)
化简2(4m^2n^2-3n^3)+5(-3m^2n^2+4n^3)
2(4m^2n^2-3n^3)+5(-3m^2n^2+4n^3)
=8m²n²-6n³-15m³n³+20n³
=-7m²n²+14n³;
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