Решите уравнение 7/13*(26/21+x)-28/54÷1427=-11/117 - вопрос №494481371326212854142711117 от Danilkez 05.07.2020 08:48

Question

Математика: Решите уравнение 7/13*(26/21+x)-28/54÷1427=-11/117

Danilkez · Answer

7/13 * (26/21 + х) - 28/54 : 14/27 = - 11/117
7/13 * (26/21 + х) - 28/54 * 27/14 = - 11/117
7/13 * (26/21 + х) - 1 = - 11/117
7/13 * (26/21 + х) = - 11/117 + 1 = (117-11)/117 = 106/117
26/21 + х = 106/117 : 7/13 = 106/117 * 13/7 = 106/63
х = 26/21 - 106/63 = (78-106)/63 = -28/63 = -4/9