1.4×1=1.4
30×0.1=3
1.4+3=4.4
4×1=4
2×1=2
2×4.4=8.8
4+0.3=4.3
4.3+8.8=13.1
ответ: 13.1
11,13,15,17,19,21,23,25,27,29
10 цифер
7 = (7·8)/8 = 56/8 7 и 5/8 = 56/8 и 5/8
9 = (9·4)/4 = 36/4 9 и 1/4 = 36/4 и 1/4
4 = (4·7)/7 = 28/7 3/7 и 4 = 3/7 и 28/7
8 = (8·10)/10 = 80/10 9/10 и 8 = 9/10 и 80/10
15 = (15·10)/10 = 150/10 15 и 3/10 = 150/10 и 3/10
20 = (20·8)/8 = 160/8 20 и 3/8 = 160/8 и 3/8
9 = (9·12)/12 = 108/12 9 и 5/12 = 108/12 и 5/12
3 = (3·11)/11 = 33/11 7/11 и 3 = 7/11 и 33/11
1) 4×5=20
2)20×678=13560
3)13560×800=10848000
4)1084000÷400=27120
5)27120÷20=1356
6)1356÷1356=1
Простые: 557 263 229 <span>
Составные:
</span><span>775 = 5*5*31
273 = 3*7*13
209 = 11*19 </span>