Первым сошло 249999 вторым 250000 а третьим 250001
№1
2.4(на 4) 0.9
----- = ---------
32 (на 4) х
0.6(на 3) 0.9(на 3)
----- = ---------
8 х
0.2(на 2) 0.3
----- = ---------
8(на 2) х
0.1 0.3
----- = ---------
4 х
0.1х=0.3*4
0.1х=1.2
х=1.2:0.1
х=12
№2
15 : x = 6.3(на 2.1) : 4.2(на 2.1)
15:х=3:2
3х=15*2
3х=30
х=30:3
х=10
№3
3.6 : 8.1 = x : 18
3.6*18=8.1х
64.8=8.1х
х=64.8:8.1
х=8
№4
3/7:1/14=0.4:х
3/7х=1/14*0.4
3/7х=1/35
х=1/35:3/7
х=1/15
-5а - (4а-3b)
-5a-4a+3b
-9a+3b
-9*(-5)+3*39
45+117 = 162
1) 4 5/12 - 2 13/24 = (4 - 2) + (5/12 - 13/24) = 2+(10/24-13/24) =
= 2 + (- 3/24) = 2 - 1/8 = 1 7/8
2) 3 1/8 : 1 7/8 = 25/8 : 15/8 = 5/3
3) 19 : 6 = 3 1/6 = 19/6
4) 4 1/8 - 5/3 = 33/8 - 5/3 = 99/24 - 40/24 = 59/24
5) 59/24 + 19/6 = 59/24 + 171/24 = 230/24
6) 230/24 * 2 2/5 = 230/24 * 12/5 = 23