Question

Решите уравнения:
(5х+2х)*14=294          (19х+6х):35=5
(12у-5у):4=21          234:(21у-8у)=3

Answer 1

(5х+2х)*14=294   
7х*14=294
7х=294:14
7х=21
х=21:7
х=3

(12у-5у):4=21
7y:4=21
7y=21*4
7y=84
y=84:7
y=12


(19х+6х):35=5
25x:35=5
25x=35*5
25x=175
x=175:25
x=7


234:(21у-8у)=3
234:13y=3
13y=234:3
13y=78
y=78:13
y=6

Answer 2

(5х+2х)*14=294
7х*14 =294;   98х=294;  х=294 /98=3

(12у-5у):4=21
7у/4 = 21; 7у = 84; у= 12

(19х+6х):35=5
25х /35 = 5;  25х = 175; х = 175/ 25 = 7

234:(21у-8у)=3
234/13у=3
13у = 234 /3
13у = 78; у = 78/13 = 6