Question

Determinati numarul x, astfel in cat:

a) (7la puterea x)puterea 9=7 la puterea 81
b) (8la puterea 5)puterea 40=2la putere 30xX
c)10 la puterea 13=50 la putere 13:x la puterea 13
d) (20:x)puterea 30=4 la puterea 30
VA ROG MUULT

Answer 1

a) (7ˣ)⁹=7⁸¹
7⁹ˣ=7⁸¹
9x=81; x=9

b) (8⁵)⁴⁰=2³ˣ
(2³)²⁰⁰=2³ˣ
3x=3*200
x=200

c)10¹³=50¹³:x¹³
x=50:10
x=5

d) (20:x)³⁰=4³⁰
x=20:4
x=5