1) 18=2*3*3
48=2*3*2*2*2
72=2*2*2*3*3
Нод чисел 18 , 48 и 72= 2*3=6
2)170 = 2 * 5 * 17 1 190 : 170 = 7
85 = 5 * 17 1 190 : 85 = 14
34 = 2 * 17 1 190 : 34 = 35
119 = 7 * 17 1 190 : 119 = 10
НОК (170, 85,34,119)= 2*5*7*17=1190
140 ост13
1040 ост2
102 ост8
310 ост7
147+129=276
147+210=357
309-115-185=9
300-115-185=0
4 11/15+2 7/20
1) 15*4+11=71/15
2) 20*2+7=47/20
3) 71/15+47/20=284/60+141/60=425/60=85/12=7 1/12
5 2/7- 4 11/14
1) 7*5+2=37/7
2) 14*11+4= 158/14
3) 37/7+158/14=224/14+158/14=382/14=191/7=27 2/7