380 + х = 510
х = 510 - 380
х = 130
700 - х = 427
х = 700 - 427
х = 273
560 : х = 70
х = 560 : 70
х = 8
24 * х = 480
х = 480 : 24
х = 20
х : 16 = 80
х = 80 * 16
х = 1 280
х * 1 = 13
х = 13 :1
х = 13
A=b*c+r
a-r=b*c
(a-r)/b=c
Отсюда(подставляем значения a, b и r) c=(38-3)/7=5
<span>11-(3- 1 4/15) : 4/25 + 8/15 = 7/10,
1) 3 - 1 4/15 = 2 15/15 - 1 4/15 = 1 11/15,
2) 1 11/15 : 4/25 = 26/15 * 25/4 = 65/6 = 10 5/6,
3) 11 - 10 5/6 = 10 6/6 - 10 5/6 = 1/6,
4) 1/6 + 8/15 = 5/30 + 16/30 = 21/30 = 7/10</span>
-1440abc (всё перемножить)