Решить пример (2 3/20+1 5/16): (30-2 3/10)+5 1/7×3 - вопрос №4124727232015163023105173172014320 от mn197 03.01.2020 20:25

Question

Математика: Решить пример (2 3/20+1 5/16): (30-2 3/10)+5 1/7×3 17/20-14 3/20

mn197 · Answer

(2 3/20 + 1 5/16) : (30 - 2 3/10) + 5 1/7 * 3 17/20 - 14 3/20 = 5 31/40

1) 2 3/20 + 1 5/16 = 2 12/80 + 1 25/80 = 3 37/80
2) 30 - 2 3/10 = 29 10/10 - 2 3/10 = 27 7/10
3) 3 37/80 : 27 7/10 = 277/80 : 277/10 = 277/80 * 10/277 = 1/8
4) 5 1/7 * 3 17/20 = 36/7 * 77/20 = 99/5 = 19 4/5
5) 1/8 + 19 4/5 = 5/40 + 19 32/40 = 19 37/40
6) 19 37/40 - 14 3/20 = 19 37/40 - 14 6/40 = 5 31/40