Решите уравнение б) (5/7-2/3у)*21=1 в)2/3х+7/3х=18 - вопрос №3196540572321123731871223147 от viktoriasmirnova200 31.01.2020 19:35

Question

Математика: Решите уравнение б) (5/7-2/3у)*21=1 в)2/3х+7/3х=18 г)7/12m+2/3m-1/4=7

viktoriasmirnova200 · Answer

( 5/7 - 2/3Y ) * 21 = 1
5/7 - 2/3Y = 1/21
5/7 - 1/21 = 2/3Y
15 - 1 = 14Y
14Y = 14
Y = 1

2/3X + 7/3X = 18
9/3X = 18
3X = 18
X = 6

7/12M + 2/3M - 1/4 = 7
7/12M + 8/12M = 75/12
15M = 75
M = 5