Question

Oblicz:
1. -5[2*(-4)-(-3)]
3- ---------------- =
[(-1)*4-(-20):2]:3
2. (1/13-0,3)*(1 1/6 + 1/12)=
3.2 1/3 (5/14-2/35)-(2,3-1 3/20)=


W 1 to jest ułamek tam ;) i w 2 i 3 np. 1/6 to ułamek xD

Answer 1

-5[2*(-4)-(-3)]
3- ---------------------- =
[(-1)*4-(-20):2]:3

-5[-8+3]
3 - -----------=
[-4+20:2]:3

40-15
3 - --------- =
[-4+10]:3

25
3 - ----------- =
6:3

25
3 - ------- =
2
3- 12,5=-9,5



(1/13-0,3)*(1 1/6 + 1/12)=(¹/₁₃-³/₁₀)×(⁷/₆+¹/₁₂)=(¹⁰/₁₃₀-³⁹/₁₃₀)×(¹⁴/₁₂+¹/₁₂)=-²⁹/₁₃₀×¹⁵/₁₂=-²⁹/₁₀₄



2 1/3 (5/14-2/35)-(2,3-1 3/20)=⁷/₃(⁵/₁₄-²/₃₅)-(²³/₁₀-²³/₂₀)=
⁷/₃(⁵⁰/₁₄₀-⁸/₁₄₀)-(⁴⁶/₂₀-²³/₂₀)=⁷/₃×⁴²/₁₄₀-²³/₂₀=⁷/₁₀-²³/₂₀=
¹⁴/₂₀-²³/₂₀=-⁹/₂₀