Question

bài 1

15x mũ 2 y mũ 2 z :3xyz

3x mũ 2 .(5x mũ 2-4x+3)

(2x mũ 2 -3x):(x-4)

-5xy (3x mũ 2y -5xy +y mũ 2)

(4 phấn 3y mũ 3 +2 phấn 3y mũ 2-1 phần 3).-3y mũ 2

(-2x mũ 3-1 phần 4y-4yz).8xy mũ 2

Answer 1

Bài 1: 

a) Ta có: \(\left(15x^2\cdot y^2\cdot z\right):3xyz\)

\(=\dfrac{15x^2y^2z}{3xyz}\)

\(=5xy\)

b) Ta có: \(3x^2\cdot\left(5x^2-4x+3\right)\)

\(=3x^2\cdot5x^2-3x^2\cdot4x+3x^2\cdot3\)

\(=15x^4-12x^3+9x^2\)

c) Ta có: \(\left(2x^2-3x\right):\left(x-4\right)\)

\(=\dfrac{2x^2-8x+5x-20+20}{x-4}\)

\(=\dfrac{2x\left(x-4\right)+5\left(x-4\right)+20}{x-4}\)

\(=2x+5+\dfrac{20}{x-4}\)

d) Ta có: \(-5xy\cdot\left(3x^2y-5xy+y^2\right)\)

\(=-5xy\cdot3x^2y+5xy\cdot5xy-5xy\cdot y^2\)

\(=-15x^3y^2+25x^2y^2-5xy^3\)