Question

Помогите пожалуйста!
15 баллов

Answer 1

Ответ:

72) x : 1/3^2 = 3^5

x :  1/9 = 243

x = 243 * 1/9

x = 27

74) 1/7^3 : x = 1/7^4

1/343 : x = 1/2401

x = 1/343 : 1/2401

x = 7

76) 1/x^2 * 1/4^3 = 1/16

1/x^2 = 1/16 : 1/64

1/x^2 = 4

x^2 = 1/4

x = 1/2

x= - 1/2

Объяснение:

Answer 2

$72)x:3^{-2}=3^{5} \\\\x=3^{-2}*3^{5}=3^{-2+5}=3^{3}=27\\\\74)7^{-3}:x=7^{-4}\\\\x=7^{-3}:7^{-4}=7^{-3-(-4)}=7^{-3+4}=7\\\\76)x^{-2}*4^{-3}=(\frac{1}{4})^{2}\\\\x^{-2}*4^{-3}=4^{-2}\\\\x^{-2}=4^{-2}:4^{-3}=4^{-2-(-3)}=4^{-2+3}=4\\\\x^{2}=\frac{1}{4}\\\\x_{1} =-\frac{1}{2}\\\\x_{2}=\frac{1}{2}$