.....................,......
4 14/19 - 2 5/19 = 2 9/19
8 7/10 - 5 = 3 7/10
12 - 7/18 = 11 11/18
11 - 3 5/12 = 7 7/12
8 7/15 - 3 11/15 = 5 - 4/15 = 4 11/15
10 9/14 - 3 9/14 = 7
1) 3,3а+(а-4)=3,3а+а-4=4,3а-4
2) 5а-(0,7+8)=5а-0,7-8=5а-8,7
3) 5,3b-(2b+3)=5.3b-2b-3=3.3b-3
4) 9.6b+(7-0.4b)=9.6b+7-0.4b=9.2b+7
5) 2с-(9-5,1с)=2с-9+5,1с=7,1с-9
6) -5с+(13-6с)=-5с+13-6с=-11с+13
45т = 450ц
290ц =29т
вот так))))))