0,4 - 2,5а + 2 - 3,4 + 6,8а = 4,3а - 1
8 : 2 2/5 = 8/1 • 5/12 = 10/3;
5 1/4 : 7 = 21/4 • 1/7 = 3/4;
10/3 : 3/4 = 10/3 • 4/3 = 40/9;
2 1/7 : 5/7 = 15/7 • 7/5 = 3;
4 : 8/9 = 4 • 9/8 = 9/2;
3 : 9/2 = 3 • 2/9 = 2/3;
40/9 : 2/3 = 40/9 • 3/2 = 20/3 = 6 2/3
608
а)3/8:1 7/12=9/38
б)50-24=26
в)50-2/3+2,4=49 1/3+2 4/10=51 11/15
г)(49/25-16/10):12/100=3
607
2/3-6/7:4/7=-1/3
11/12:7/24*21/22=3
15/16*8/3=7/4=1 3/4
3 3/4-(4 1/2:6 3/4)=3 1/12
(2 2/7+1 1/7)-1 1/6=2 11/42
6 1/2-4 1/4:2 1/2=3/10