Ответ:
13 2/3 - 11,2 : 9 1/3 = 13 2/3 - 11 1/5 : 9 1/3 = 13 2/3 - 11 3/15 : 9 5/15 = 13 2/3 - 168/15 : 140/15 = 13 2/3 -
168 • 15
------------
15 • 140
= 13 2/3 - 6/5 = 13 10/15 - 18/15 = 12 25/15 - 18/15 = 12 7/15
8 2/7 - 5a = 58/7 - 5a > 0; 5a < 58/7; a < 58/35
9,3 - 4a > 0; 4a < 9,3; a < 9,3/4 = 93/40
11 3/11 - 31a > 0; 31a < 124/11; a < 124/341
11,11 + 11a > 0; 1,01 + a > 0; a > -1,01
7 2/15 + 2/3*a > 0; 2/3*a > -107/15; a > -107/10 = -10,7
50,5 - 0,5a > 0; 101 - a > 0; a < 101
360=18x
2x-соль
16x-вода
x=360/18=20
2x=20*2=40
Ответ:40г
<span> 7*(3х+8)+13*(6+5х)+2*(6х-13)=206
21х +56+78+65х+12х - 26=206
98х + 108=206
98х=206 - 108
98х=98
х = 98 : 98
х=1</span>