20/27 * 3/5 + 1/10 : 3/100 = 3 7/9
20/27 * 3/5 + 1/10 : 3/100 = 4/9 + 1/10 : 3/100 = 4/9 + 1/10 * 100/3 = 4/9 + 10/3
НОК(9,3) = 9
(4*1 + 10*3)/9 = (4 + 30)/9 = 34/9 = 3 7/9
3/4 ÷ 9/16 - 5/8 * 4/15 = 1 1/6
3/4 ÷ 9/16 - 5/8 * 4/15 = 3/4 * 16/9 - 5/8 * 4/15 = 4/3 - 5/8 * 4/15 = 4/3 - 1/6
НОК(3,6) = 6
(4*2 - 1*1)/6 = (8 - 1)/6 = 7/6 = 1 1/6
<span><span>V=S/t
S1=S/3
t1=t/4
S2=2S/3
t2=3t/4
V1=4S/3t
V2=8S/9t
S/t=54км/ч (по усл.) =>
=> V1=4/3*54=72км/ч
=> V2=8/9*54=48км/ч</span></span>
1. 1 и 2
2.1 и 4
3.-7 и -8
4.0 и -1
5.-10 и -11
6.0 и 1
7.-15 и -16
8.-18 и -19