<span>40 = 2 · 2 · 2 · 5
</span>3 = 3<span>
НОК (3; 40) = 2 · 2 · 2 · 5 · 3 = <span>120
</span></span>
<span>30 = 2 · 3 · 5
</span>7 = 7<span>
НОК (7; 30) = 2 · 3 · 5 · 7 = <span>210
</span></span>
<span>21 = 3 · 7</span><span>
14 = 2 · 7</span><span>
НОК (21; 14) = 3 · 7 · 2 = <span>42
</span></span>
<span>12 = 2 · 2 · 3
</span>8 = 2 · 2 · 2<span>
НОК (8; 12) = 2 · 2 · 3 · 2 = <span>24
</span></span>
<span>25 = 5 · 5
</span>20 = 2 · 2 · 5<span>
НОК (20; 25) = 5 · 5 · 2 · 2 = <span>100
</span></span>
<span>38 = 2 · 19</span><span>
19 = 19</span><span>
НОК (38; 19) = 2 · 19 = <span>38</span></span>
10/(х-4)=2 х≠4
10=2(х-4)
2х-8=10
2х=18
х=9
(6-5у)/2= - 4,5
6-5у= - 4,5*2
6-5у= - 9
-5у=-9-6
-5у= - 15
у=3
(2у+1)/3=5
2у+1=5*3
2у+1=15
2у=14
у=7
6,2/(3у+1)=2
6,2=2(3у+1)
6у+2=6,2
6у=4,2
у=4,2:6
у=0,7
ВИЕТ
2838÷26
26 109.153846
0238
234
40 и дальше
1) 180 : 36 = 5 км/день - 1-ая машина
2) 180 : 45 = 4 км/день - 2-ая машина
3) 180 : (4+5) = 20 дней
(5/12+1/8)÷3/8 = (10/24+3/24)÷3/8=13/24÷3/8=13/24*8/3=13/3*1/3=13/9
2 1/4÷1 4/11 - 3/8÷7/8= 9/4÷15/11 - 3/8*8/7=9/4*11/15-3/1*1/7=3/4*11/5-3/7=33/20-3/7=231/140 - 60/140= 171/140=1 31/140