Question

Решить пример ( 16,2 - 1 14/15)÷(1 5/7+3 8/21)

Answer 1

( 16,2 - 1 14/15)÷(1 5/7+3 8/21) = 2,8
1) 16,2 - 1 14/15 = 16 2/10 - 29/15 = 162/10 - 29/15 = (162*3 - 29*2)/30 =
=14 8/30
2) 1 5/7+3 8/21 = 12/7+71/21 = (12*3+71)/21 = 107/21 =5 2/21
3) 14 8/30 ÷ 5 2/21 = 428/30 * 21/107 = 8988/3210 = 2 8/10 = 2,8