1) 1/10x=4/5
0,1x = 0,8
x = 0,8 : 0,1
x = 8
2) ¹/₈x=⁵/₆
x = ⁵/₆ : ¹/₈
x = ⁵/₆ × ⁸/₁
x = ⁵ˣ⁸/₆ₓ₁
x = ⁴⁰/₆
x = 6⁴/₆
x = 6²/₃
3) ¹/₂x=²/₃
x = ²/₃ : ¹/₂
x = ²/₃ × ²/₁
x = ²ˣ²/₃ₓ₁
x = ⁴/₃
x = 1¹/₃
4) ¹/₁₂x=⁵/₆
x = ¹/₁₂ : ⁵/₆
x = ¹/₁₂ × ⁶/₅
x = ¹ˣ⁶/₁₂ₓ₅
x = ¹/₂ₓ₅
x = ¹/₁₀
x = 0,1