Помогите с 4, 5, 6, 7 и 8, пожалуйста, очень нужно
▪4) 21/53 = 220/(у+300) 21×(у+300) = 53 × 220 у+300 = 11660 ÷ 21 у = 555 5/21 - 300 у = 255 целых 5/21 _______________ ▪5) 29/30 = 78/(3у-2) 3у-2 = 30 × 78 ÷ 29 = 2340 ÷ 29 = 80 целых 20/29 у = (80 20/29 + 2)÷3 = 82 20/29 ÷ 3 = 2398/29 × 1/3 = 2398/87 = 27 49/87 у = 27 целых 49/87 _______________ ▪6) 52/(4у+2) = 14/(3^3) 4у+2 = (52 × 27)÷14 = 1404/14 = 702/7 = 100 целых 2/7 у = (100 2/7 - 2)÷4 = 98 2/7 ÷ 4 = 688/7 × 1/4 = 688/28 = 172/7 = 24 4/7 у = 24 целых 4/7 _______________ ▪7) 13/17 = (7+2у)/85 7+2у = (13 × 85)÷17 = 1105/17 = 65 у = (65 - 7)÷2 = 58÷2 у = 29 _______________ ▪8) 55/90 = (6 - 5у)/18 6-5у = (55 × 18)÷90 = 990/90 = 11 у = (11 - 6)÷(-5) = -5/5 у = -1
