1)3\4*(х-1\4)=1 5\16
³/₄x - ³/₄ˣ¹/₄ = 1⁵/₁₆
³/₄x - ³/₁₆ = 1⁵/₁₆
³/₄x = 1⁵/₁₆ + ³/₁₆
³/₄x = 1⁸/₁₆
³/₄x = 1¹/₂
x = 1¹/₂ : ³/₄
x = 2
2) (3 4\5-х):12\13=13\20
¹⁹/₅ - x = ¹²/₁₃ ˣ ¹³/₂₀
¹⁹/₅ - x = ³/₅
-x = ³/₅ - ¹⁹/₅
-x = - ¹⁶/₅
x = 3 ¹/₅
x = 3,2
3)5 2\3*(12-х)=1⁵\₁₂
¹⁷/₃ ˣ (12-х)=1⁵\₁₂
12-х =1⁵\₁₂ : ¹⁷/₃
12-х = ¹⁷/₁₂ : ¹⁷/₃
-x = ¹/₄ - 12
-x = - 11 ³/₄
x = 11,75
4) (х-2 ¹\₈):7 ⁵\₆ = 1
х-2 ¹\₈ = 1 ˣ 7 ⁵\₆
х-2 ¹\₈ = 7 ⁵\₆
x = 7 ⁵\₆ + 2 ¹\₈
x = ⁴⁷/₆ + ¹⁷/₈
x = 9 ²³/₂₄
5) (10-х):¹²\₃₅ = ³⁵\₁₂
10 - x = ³⁵\₁₂ ˣ ¹²\₃₅
10 - x = 1
- x = 1 - 10
- x = - 9
x = 9