Question

BT10: Thực hiện phép tính

\(a,-xyz^2\)\(-3xz.yz\)

\(b,-8x^2\)\(y-x.\left(xy\right)\)

\(c,4xy^2\) \(.x-\left(-12x^2y^2\right)\)

\(d,\dfrac{1}{2}x^2y^3-\dfrac{1}{3}x^2y.y^2\)

\(e,3xy\left(x^2y\right)-\dfrac{5}{6}x^3y^2\)

\(f,\dfrac{3}{4}x^4y-\dfrac{1}{6}xy.x^3\)

Answer 1

a: =-4xyz^2

b: =-9x^2y

c: =16x^2y^2

d: =1/6x^2y^3

e: =13/6x^3y^2

f: =7/12x^4y

Answer 2

a) -xyz² - 3xz.yz

= -xyz² - 3xyz²

= -4xyz²

b) -8x²y - x.(xy)

= -8x²y - x²y

= -9x²y

c) 4xy².x - (-12x²y²)

= 4x²y² + 12x²y²

= 16x²y²

d) 1/2 x²y³ - 1/3 x²y.y²

= 1/2 x²y³ - 1/3 x²y³

= 1/6 x²y³

e) 3xy(x²y) - 5/6 x³y²

= 3x³y² - 5/6 x³y²

= 13/6 x³y²

f) 3/4 x⁴y - 1/6 xy.x³

= 3/4 x⁴y - 1/6 x⁴y

= 7/12 x⁴y