1)решите уравнения : а(3х+5х)*18=144 б) (7у-3у):8=17 в) (6а+а):13=14 г) 48:(9b-b)=2

a) (3 * x + 5 * x ) * 18 = 144

(3 + 5) * x * 18 = 144

8 * x * 18 = 144

144 * x = 144

x = 144/144

x = 1 .

б) (7 * у - 3 * у ) : 8 = 17

[ (7 - 3) * y ] : 8 = 17

(7 - 3 * y ) : 8 = 17

4 * у : 8 = 17

у * 4/8 = 17

у * 1/4 = 17

у = 17 : 1/4

у = 17 * 4/1

у = 17 * 4 

у = 68

в) (6 * а + а ) : 13 = 14

(6 + 1) * a : 13 = 14

7 * а : 13 = 14

а * 7/13 = 14

а = 14 : 7/14

а = 14 * 14/7

а = 14 * 2

а = 28 .

г) 48 : (9 * b - b ) = 2

48 : [ (9 - 1) * b ] = 2

48 : (8 * b ) = 2

8 * b = 48/2

8 * b = 24

b = 24/8

b = 3 .