1. а, в.
2. 17, 19.
3. 240=2х2х2х2х3х5, 36=2х2х3х3, общее будет: 2х2х2х2х3х5 х 3=720
4. 7/30+5/12=7х2/60+5х5/60=(14+25)/60=39/60
3/8-1/60=3х15/120-1х2/120=(45-2)/120=43/120
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1. а, в.
2. 17, 19.
3. 240=2х2х2х2х3х5, 36=2х2х3х3, общее будет: 2х2х2х2х3х5 х 3=720
4. 7/30+5/12=7х2/60+5х5/60=(14+25)/60=39/60
3/8-1/60=3х15/120-1х2/120=(45-2)/120=43/120
2. 21 и 11
3.240 = 24 · 3 · 5
36 = 22 · 32
Наименьшее общее кратное = 24 · 32 · 5 = 720
4.7/30+5/12=14/60+25/60=39/60=13/20
3/8-1/60=45/120-2/120=43/120