$a)$ \(x^{12}:\left(-x\right)^6\)
\(=x^{12}:x^6\)
\(=x^{12-6}\)
\(=x^6\)
$b) $ \(\left(-x\right)^7:\left(-x\right)^5\)
\(=\left(-x\right)^{7-5}\)
\(=\left(-x\right)^2\)
\(=x^2\)
$c)$ \(5x^2y^4:10x^2y\)
\(=\dfrac{1}{2}y^3\)
$e)$ \(\left(-xy\right)^{14}:\left(-xy\right)^7\)
\(=\left(-xy\right)^{14-7}\)
\(=\left(-xy\right)^7\)
Các câu còn lại tương tự nha bạn!
a,x12 : (-x)6 = x12 : x6 =x12-6 = x6
b,-x7 : -x5 = x7 : x5 = x7-5= x2
c,5x3y4 : 10x2y = (5 : 10)(x3 : x2)(y4: y) = \(\dfrac{1}{2}\)xy3
d,\(\dfrac{3}{4}\)x3y3 : \(\dfrac{-1}{2}\)xy2 = (\(\dfrac{3}{4}\): -\(\dfrac{1}{2}\))(x3 : x)(y3 : y2)= -\(\dfrac{3}{2}\)x2y
e,(-xy)14 : (-xy)7 = (-xy)14-7 = (-xy)7
f, câu này đề bài sai đó bn
g(3x2y2 - 6x2y + 12xy) : 3xy
= 3xy(xy - x + 4) : 3xy
= xy - x + 4
