Question

Làm tính chia :

a) \(5^3:\left(-5\right)^2\)

b) \(\left(\dfrac{3}{4}\right)^5:\left(\dfrac{3}{4}\right)^3\)

c) \(\left(-12\right)^3:8^3\)

Answer 1

Bài giải:

a) 5³ : (-5)² = 5³ : 5² = 5^{3 – 2} = 5

b) ${\left(\frac{3}{4}\right)}^5$: ${\left(\frac{3}{4}\right)}^3$= ${\left(\frac{3}{4}\right)}^{5-3}$= ${\left(\frac{3}{4}\right)}^2$ = $\frac{9}{16}$

c) (-12)³ : 8³ = -12³ : 8³= (-4 . 3)³ : (4 . 2)³ = ${\left(\frac{-4.3}{4.2}\right)}^3$= ${\left(-\frac{3}{2}\right)}^3$= -$\frac{27}{8}$

Answer 2

a) 5³ : (-5)² = 5³ : 5² = 5^{3 – 2} = 5

b)( \(\dfrac{3}{4}\))⁵:(\(\dfrac{3}{4}\))³= \(\dfrac{3}{4}\)= )²= \(\dfrac{9}{16}\)

c) (-12)³ : 8³ = -12³ : 8³= (-4 . 3)³ : (4 . 2)³ = (\(\dfrac{-4\cdot3}{4\cdot2}\)= )³= \(\dfrac{-27}{8}\)