-8,76+(+3,25+10,76)= -6,19-(+1,5-5,19)= -9/20-(11/20-5/6)= 17/28+5/18-(3/28-13/18)=

Question

-8,76+(+3,25+10,76)=

-6,19-(+1,5-5,19)=

-9/20-(11/20-5/6)=

17/28+5/18-(3/28-13/18)=

Answer 1

1) -8,76+(+3,25+10,76)=  -8,76+14,01 =  5,25

2) -6,19-(+1,5-5,19)= -6,19+3,69 = - 2,5 

3) -⁹/₂₀-(¹¹/₂₀-⁵/₆)= ²/₁₅
    ¹¹/₂₀-⁵/₆ = ³ˣ¹¹/₆₀ - ⁵ˣ¹⁰/₆₀ = ³³/₆₀ - ⁵⁰/₆₀= ³³⁻⁵⁰/₆₀ = - ¹⁷/₆₀ - ⁹/₂₀ + ¹⁷/₆₀ = ⁻⁹⁺¹⁷/₆₀ = ⁸/₆₀ = ²/₁₅

4) ¹⁷/₂₈+⁵/₁₈-(³/₂₈-¹³/₁₈)=¹⁷/₂₈+⁵/₁₈-³/₂₈+¹³/₁₈= ¹⁷⁻³/₂₈ + ⁵⁺¹³/₁₈ = ¹⁴/₂₈+¹⁸/₁₈= ¹/₂+1= 1¹/₂ = 1,5

Answer 2

1) 5,25
2) -2,5
3) 1,5

-_- типо так