Câu hỏi của Lê Cẩm

Question

1. Tính g. ( x+3) ( x^2 + 3 ) ( x^2 +3x -5)

h. (xy -2) (x^3 -2x -6 )

i. ( 5x^3 - x^2 +2x -3 ) ( 4x^2 -x+2)

Lưu Hạ Vy · Accepted Answer

g) $\left(x+3\right).\left(x^2+3\right).\left(x^2+3x-5\right)$

$\left(x^3+3x+3x^2+9\right).\left(x^2+3x-5\right)$

$\left(x^5+3x^4-5x^3+3x^3+9x^2-15x+3x^4+9x^3-15x^2+9x^2+27x-45\right)$

$x^5+6x^4+x^3+3x^2+12x-45$

h) $\left(xy-2\right)\left(x^3-2x-6\right)$

$xyx^3-xy.2x-6xy-2x^3-2.\left(-2x\right)-2.\left(-6\right)$

$x^4y-2x^2y-6xy-2x^3+4x+12$

i) $\left(5x^3-2^2+2x-3\right)\left(4x^2-x+2\right)$

$\left(5x^3-4+2x-3\right)\left(4x^2-x+2\right)$

$20x^5-5x^4+10x^3-28x^2+7x-14+8x^3-2x^2+4x$

$20x^5-5x^4+18x^3-30x^2+11x-14$

_Có sai sót j bỏ qua cho e :v _Câu trả lời: g) $\left(x+3\right).\left(x^2+3\right).\left(x^2+3x-5\right)$