Вычислите 1) 5\7*(21\20-7\30)+16\21:8\7

Question

Вычислите 1) 5\7*(21\20-7\30)+16\21:8\7

Answer 1

5/7 * (21/20 - 7/30) + 16/21 : 8/7 = 1 1/4
1) 21/20 - 7/30 = 63/60 - 14/60 = 49/60
2) 5/7 * 49/60 = 7/12
3) 16/21 : 8/7 = 16/21 * 7/8 = 2/3
4) 7/12 + 2/3 = 7/12 + 8/12 = 15/12 = 1 3/12 = 1 1/4