5/6 = (5*4)/(6*4)=20/24
11/9 = (11*3)/(9*3) = 33/27
2. 4/5 = (4*2)/(5*2) = 8/10
13/25 = (13*4)/(25*4) = 52/100
5/8 = (5*125)/(8*125) = 625/1000
12/125 = (12*8)/(125*8) = 96/1000
133/500 = (133*2)/(500*2) = 266/1000
1)15*7/30*4=105/120=7/8
2)15*11/18*33=5/18
3)7*9*25/21*3*50=1/2
4)16*13*23/69*8*26=1/3
5)29*5*13/52*20*58=1/32
6)37*39*75/111*42*100=13/56
1 сек=1_60,10 сек=10_60,300 сек=5 ч,600 сек=10 ч.
<em>Решение ;
к - b * 4 =
Я думаю так.
</em>