\(a,\left(2x-1\right)\left(4x^2+2x-1\right)-8x^3+16x\)
\(\Leftrightarrow\)\(8x^3+4x^2-2x-4x^2-2x+1-8x^3+16x\)
\(\Leftrightarrow\)\(4x^2-2x-4x^2-2x+1+16x\)
\(\Leftrightarrow12x+1\)
\(b,\left(x+2\right)^3-x^2\left(x+6\right)-2x-5\)
\(\Leftrightarrow x^3+6x^2+12x+8-x^3-6x^2-2x-5\)
\(\Leftrightarrow6x^2+12x+8-6x^2-2x-5\)
\(\Leftrightarrow10x+3\)
Mình cũng không biết đúng hay sai nữa :V
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