Question

Bài 4 : Làm phép tính chia :
a, 8^3 : ( -8 )^-5
b, ( -5/16 )^12 : ( 5/-6 )^4
c, ( 5/3 )^6 : ( 5/3 )^4
d, ( 9/7 )^9 : ( -9/-7 )^3
Giúp mk vs ạ mk đang cần gấp ạ

Answer 1

Lời giải:
a) $8^3:(-8)^{-5}=8^3:(-8^{-5})=-(8^3:8^{-5})$

$=-8^{3-(-5)}=-8^{13}$

b) $(\frac{-5}{16})^{12}:(\frac{5}{-16})^4$

$=(\frac{-5}{16})^{12}:(\frac{-5}{16})^4$

$=(\frac{-5}{16})^{12-4}=(\frac{-5}{16})^8=(\frac{5}{16})^8$

c) $(\frac{5}{3})^6:(\frac{5}{3})^4=(\frac{5}{3})^{6-4}=(\frac{5}{3})^2$

d)

$(\frac{9}{7})^9:(\frac{-9}{-7})^3=(\frac{9}{7})^9:(\frac{9}{7})^3$

$=(\frac{9}{7})^{9-3}=(\frac{9}{7})^4$