32/5;59/8;41/9;53/10;75/11;44/5;187/20
25л - 100%
Хл - 21%
Х=(25 * 212) :100 = 21:4=5,25(л)
X+23=54-12-31=11
x=11-23
x= -12
1) 10 1\2 : 1 1\2 = 21\2 : 3\2 = 21*2\2*3=42\6=7
2) 1 23\52 - 1 1\4 = 75\52 - 5\4 = 75\52 - 65\52 = 10\52
3) 15:3 3\4 = 15\1 : 15\4 = 15*4\1*15=4
4)7*3\14 = 7\1 * 3\14 = 3\2
5) 4-3\2= 2, 5
6) 2, 5 : 10\52 = 25\10: 10\52 = 25*52\10*10= 13
Ответ : 13.