Question

1.Thu gọn các biểu thức sau :

a)\(x^2\)(\(\dfrac{-1}{3}y\)).\(\dfrac{1}{5}\)\(x^4\)

b)-y2\(x^3y\dfrac{4x}{5}ab^5\)

c)(\(-4^2\)).(\(\dfrac{3}{4}\))\(v^3\left(\dfrac{-2}{5}\right)uv\)

d)8.\(\left(-4\right)^3\).5\(\left(uv\right)^2.\left(-3v\right)^3\)

e)-10y\(\left(2yz\right)^3.\left(-5z\right)^2\)

f)2ax.\(\left(-y\right)^2-x\left(\dfrac{-2}{3}y\right)^2+bx\left(by\right)^2\)

Answer 1

a: \(=-\dfrac{1}{15}x^6y\)

b: \(=\dfrac{4}{5}ab^5\cdot2x^3y\cdot\left(-y\right)=-\dfrac{8}{5}ab^5\cdot x^3y^2\)

c: \(=-16\cdot\dfrac{3}{4}v^3\cdot\dfrac{-2}{5}uv=\dfrac{24}{5}v^4u\)

d: \(=8\cdot\left(-64\right)\cdot5\cdot u^2v^2\cdot\left(-27\right)v^3=69120u^2v^5\)

e: \(=-10y\cdot8y^3z^3\cdot25z^2=-2000y^4z^5\)