Реши уравнение.....( х + 20 ) ·45 =3105....... х ÷ 34 =17000 + 204 ....... 57 · (500-х)=11457.... 16912 ÷ х=7890 - 7834

1) (х+20) * 45 = 3105
45х + 900 = 3105
45х = 2205
х= 2205: 45
х=49

2)х: 34 = 17000+ 204
х:34 = 17204
х= 17204* 34
х= 584936

3)57* (500 - х) = 11457
28500 - 57х = 11457
-57х = 11457 - 28500
 -57х = -17043
х=299

4)16912 : х = 7890 - 7834
16912 : х = 56
56х = 16912
х = 302