573300 ! 700
56 ! -------
--- ! 819
13
-
7
----
63
-
63
------
0
<span>16 с + 20=7 с + 74</span>
<span>16с-7с=74-20</span>
<span>9с=54</span>
<span>с=54:9</span>
<span>с=6</span>
<span>Ответ:6</span>
<span>Проверка:</span>
<span>16*6+20=7*6+74</span>
<span>116=116</span>
3) (664-4×63)/4=(664-252)/4=412/4=103
4) ((1/3)/2)x=5
1/6x=5
x=30
Ответ: 3) 103; 4) 30