8m(m²-3m+4)-m²(m-3)=8m^3-24m^2+32m-m^3+3m^2=7m^3-21m^2+32m7x(2x-1)-3x(4x-1)-2x(x+3)=14x^2-7x-12x^2+3x-2x^2-6=-4x-6(-2a²b)²(ab²-a²b+a三次方)=4a^4b^2(ab²-a²b+a...
8m(m²-3m+4)-m²(m-3)=?
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