А) -1/12*3/5-2/3: (-10/9) б) 8/15*(-1/2)-3/10: - вопрос №68135841123523109815123106551647213294 от yana3657 27.02.2021 09:01

Question

Математика: А) -1/12*3/5-2/3: (-10/9) б) 8/15*(-1/2)-3/10: (-6/5) в) -5/16*4/7-21/32: (-9/4) г) -8/25*15/14-11/48: (-7/8)

yana3657 · Answer

А) -¹/₁₂ ˣ ³/₅ - ²/₃ : (-¹⁰/₉) = - 0,55
-¹/₁₂ ˣ ³/₅ = - ³/₆₀ = - ¹/₂₀
²/₃ : (-¹⁰/₉) = ²/₃ × (-⁹/₁₀) = - ¹⁸/₃₀
- ¹/₂₀ +(- ¹⁸/₃₀) = - ¹/₂₀ - ¹⁸/₃₀ = ⁻³⁻³⁶/₆₀ = - ³³/₆₀ = - ¹¹/₂₀ = - 0,55

б) ⁸/₁₅ × (-¹/₂) - ³/₁₀ : (-⁶/₅) = - ¹/₆₀
⁸/₁₅ × (-¹/₂) = - ⁸/₃₀
³/₁₀ : (-⁶/₅) = ³/₁₀ × (-⁵/₆) = - ¹⁵/₆₀
- ⁸/₃₀ - (- ¹⁵/₆₀) = - ⁸/₃₀ + ¹⁵/₆₀ = ¹⁵/₆₀ - ⁸/₃₀ = ¹⁵⁻¹⁶/₆₀ = - ¹/₆₀

в) -⁵/₁₆ × ⁴/₇ - ²¹/₃₂ : (-⁹/₄) = ¹/₁₂
-⁵/₁₆ × ⁴/₇ = - ²⁰/₁₁₂ = - ⁵/₂₈
²¹/₃₂ : (-⁹/₄) = ²¹/₃₂ × (-⁴/₉) = - ⁷/₂₄
- ⁵/₂₈ - (- ⁷/₂₄) = - ⁵/₂₈ + ⁷/₂₄ = ²⁸/₃₃₆ = ¹/₁₂

г) -⁸/₂₅ × ¹⁵/₁₄ -¹¹/₄₈ : (-⁷/₈) = - ¹²⁷/₂₁₀
-⁸/₂₅ × ¹⁵/₁₄ = - ⁸ˣ¹⁵/₂₅ₓ₁₄ = - ¹²/₃₅
¹¹/₄₈ : (-⁷/₈) = ¹¹/₄₈ × (-⁸/₇) = - ¹¹ˣ⁸/₄₈ₓ₇ = - ¹¹/₄₂
- ¹²/₃₅ - (- ¹¹/₄₂) = - ¹²/₃₅ + ¹¹/₄₂ = - ¹²⁷/₂₁₀