Đáp án:

a) (1$\frac{x}{y}$ 2)$x^{5}$ × (1$\frac{x}{y}$ 4)$x^{2}$ 

=1$\frac{x}{y}$ 32 × 1$\frac{x}{y}$ 16

=1$\frac{x}{y}$ 512

b) (-1$\frac{x}{y}$ 2)$x^{2}$ ×(2$\frac{x}{y}$ 5)$x^{2}$ 

=1$\frac{x}{y}$ 4×4$\frac{x}{y}$ 25

=1$\frac{x}{y}$ 25

 c) 3$x^{9}$ ×9$x^{-1}$ 

=19683×1$\frac{x}{y}$ 9

=2187

d) 25 ×5$x^{-1}$ ×5$x^{0}$ 

=25×1$\frac{x}{y}$ 5×1

=5×1

=5

e) (5$\frac{x}{y}$ 2)$x^{3}$ ×(4$\frac{x}{y}$ 5)$x^{3}$

=125$\frac{x}{y}$ 8 ×64$\frac{x}{y}$ 125

=8

f) (1$\frac{x}{y}$ 9)$x^{3}$ ÷(1$\frac{x}{y}$ 3)$x^{3}$ 

=1$\frac{x}{y}$ 729 ÷1$\frac{x}{y}$ 27

=1$\frac{x}{y}$ 27

g) (5$\frac{x}{y}$ 4)$x^{2}$ ÷(35$\frac{x}{y}$ 24)$x^{2}$ 

=25$\frac{x}{y}$ 16÷1225$\frac{x}{y}$ 576

=36$\frac{x}{y}$ 49

Giải thích các bước giải:

vote 5 sao cho tui nhen tui mất nhìu thời gian lắm đó

Câu $g$ mình chịu ==!

$a$) `(1/2)^5 . (1/4)^2`

`= 1/32 . 1/16`

`= 1/512`

$b$) `(-1/2)^2 . (2/5)^2`

`= 1/4 . 4/25`

`= 1/25`

$c$) `3^9 . 9^{-1}`

`=3^9 . 1/3^2`

`= 3^7`

`= 2187`

$d$) `25 . 5^{-1} . 5^0`

`= 5^{2-1+0}`

`= 5`

$e$) `(5/2)^3 . (4/5)^3`

`= {125}/8 . 64/125`

`= 8`

$f$) `(1/9)^2:(1/3)^3`

`= 1/81 : 1/27`

`= 1/3`

$h$) `(5/4)^2 : (-35/24)^2`

`= 25/16 . 576/{-1225}`

`= -36/49`