Bài làm :
\(\left(9x-2\right)\left(x^2-5x+1\right)-x\left(x^2+11\right)\)
\(=9x^3-45x^2+9x-2x^2+10x-2-x^3-11x\)
\(=\left(9x^3-x^3\right)+\left(-45x^2-2x^2\right)+\left(9x+10x-11x\right)-2\)
\(=8x^3-47x^2+8x-2\)
Học tốt nhé
( 9x - 2 )( x2 - 5x + 1 ) - x( x2 + 11 )
= 9x3 - 45x2 + 9x - 2x2 + 10x - 2 - x3 - 11x
= 8x3 - 47x2 + 8x - 2
Bài giải
\(\left(9x-2\right)\left(x^2-5x+1\right)-x\left(x^2+11\right)\)
\(=9x^3-45x^2+9x-2x^2+10x-2-x^3-11x\)
\(=8x^3-47x^2+8x-2\)
