194*2 =388
72*4 =288
____________
194*2=?
↓ ↓
100*2=200
90*2=180
4*2=8
200+180+8=388
_______________
72*4=?
↓ ↓
70*4=280
2*4=8
280+8=288
_________________
1)
15% = 0,15,
6,4% = 0,064,
35% = 0,35,
116% = 1,16,
105% = 1,05,
220% = 2,2,
2)
17/20 = 85/100 = 85%,
11/25 = 44/100 = 44%,
21/50 = 42/100 = 42%,
0,05 = 5%,
0,74 = 74%,
1 1/2 = 3/2 = 150/100 = 150%,
1 3/5 = 8/5 = 160/100 = 160%,
2 3/25 = 53/25 = 212/100 = 212%
Ответ: 3/70
ИЩЕМ ОБЩИЙ ЗНАМЕНАТЕЛЬ В ОБЕИХ СКОБКАХ И ПЕРЕМНОЖАЕМ