Question

25 la puterea 30 : 5 la puterea 2 = ?
32 la puterea 10 : 8 la puterea 5 = ?
5x-2(x-3)=20+x

Answer 1

25³⁰ : 5² = ( 5² ) ³⁰  : 5² = 5⁶⁰ ⁻ ² = 5⁵⁸

sau: 25³⁰ : 25 = 25 ⁽ ³⁰ ⁻ ¹ ⁾ = 25²⁹

32¹⁰ : 8⁵ = ( 2⁵) ¹⁰ : ( 2³ ) ⁵ = 2 ⁵⁰ : 2 ¹⁵  = 2 ⁽ ⁵⁰ ⁻ ¹⁵ ⁾ = 2 ³⁵

5 x - 2 x + 6 = 20 + x

3 x - x = 20 - 6

2 x = 14

x = 14 : 2

x = 7