Question

1. Вычисли: А)- 2.5 - (- 1-2/5 + 2-1/3) Б)- 4,544 - (2,76 - 1,386) В)3-2/19 - (- 7/19 - 1-1/2) (1-2/5 это одна целая две пятых)

Answer 1

А) - 2,5 - (- 1²/₅ + 2¹/₃) = 3¹³/₃₀
- 1²/₅ + 2¹/₃ = -⁷/₅ + ⁷/₃ = -⁷ˣ³/₁₅ + ⁷ˣ⁵/₁₅ = -²¹/₁₅+³⁵/₁₅=⁻²¹⁺³⁵/₁₅=¹⁴/₁₅
-2,5 - ¹⁴/₁₅= -²⁵/₁₀ - ¹⁴/₁₅= -²⁵ˣ³/₃₀-¹⁴ˣ²/₃₀= -⁷⁵/₃₀-²⁸/₃₀=⁻⁷⁵⁻²⁸/₃₀=¹⁰³/₃₀=3¹³/₃₀

Б)- 4,544 - (2,76 - 1,386)= -4,544 - 1,374= - 5,918

В)3 - ²/₁₉ - (- ⁷/₁₉ - 1¹/₂)=4²⁹/₃₈
3 - ²/₁₉ - (- ⁷/₁₉ - 1¹/₂)=3-²/₁₉ +⁷/₁₉+1¹/₂=3+⁵/₁₉+1¹/₂=4 +(⁵/₁₉+¹/₂)=4+(¹⁰/₃₈+¹⁹/₃₈)=4 ²⁹/₃₈

Answer 2

-2,5 - (-1 2/5 + 2 1/3)= -2,5 + 1 2/5 - 2 1/3= - 25/10+7/5-7/3=
= - 5/2 +7/5 -7/3 = -75/30+42/30-70/30= - 103/30 = - 3 13/30
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- 4,544 -2,76 + 1,386 = - 7,304 + 1,386 = - 5,918
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3 - 2/19-(-7/19 - 1 1/2 = 3-2/19+7/19+3/2 = 3-4/38+14/38+57/38 =
= 3 + 67/38 = 3 + 1 29/38 = 4 29/38