\(A=-3x^2+15x+3x^2-12x-3x+10\)
\(=\left(-3x^2+3x^2\right)+\left(15x-12x-3x\right)+10=10\)
Vậy.......
\(B=4x^3-28x^2+8x-4x^3+28x^2-8x+20\)
\(=\left(4x^3-4x^3\right)+\left(-28x^2+28x^2\right)+\left(8x-8x\right)+20=20\)
Vậy .........
\(C=5x^3-5x^2-5x^3+5x^2-15=\left(5x^3-5x^3\right)=\left(-5x^2+5x^2\right)-15=-15\)
Vậy .........
\(D=7x^2-35x+21-7x^2+35x-14\)
\(=\left(7x^2-7x^2\right)+\left(-35x+35x\right)+\left(21-14\right)=7\)
Vậy .........
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