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