Б) (47*1/26)*13/27; (20*1/26)*13/27; . в)(1/2*3/4)*(2/3)*(5/6*7/8)*(6/7*8/9);

Б) (47×¹/₂₆)×¹³/₂₇ = ⁴⁷/₂₆ × ¹³/₂₇ = ⁴⁷ˣ¹³/₂₆ₓ₂₇ = ⁴⁷/₂ₓ₂₇ = ⁴⁷/₅₄

(20×¹/₂₆)×¹³/₂₇ =  ²⁰/₂₆×¹³/₂₇ = ²⁰ˣ¹³/₂₆ₓ₂₇ = ²⁰/₂ₓ₂₇ = ²⁰/₅₄ = ¹⁰/₂₇

в)(1/2×3/4)×(2/3)×(5/6×7/8)×(6/7×8/9) = 2,5
1/2 × 3/4 = 3/8
3/8 × 2/3 = 2/8 = 1/4
5/6 × 7/8 = 35/48
1/4 × 35/48 = 140/48 = 35/12
6/7 × 8/9 = 54/63
35/12 × 54/63 = 5/2 = 2,5