Question

Determinati c.m.m.d.c si c.m.m.m.cal numerelor:
a)15 si 25
b)420,490,350

Answer 1

a) (15 ;25)=5
    [15;25] =75

b) (420;490;350) =70
 [420;490;350]=14700

Answer 2

15=5*3
25=5*5
cmmdc=5
cmmmc=5*3*5=75

420=5*2*2*3*7
490=5*2*7*7
350=5*2*5*7
cmmdc=5*2*7=70
cmmmc=5*5*2*2*7*7*3=14700

cmmdc=toti divizorii comuni luati la puterea cea mai mica o singura data
cmmmc=toti divizorii comuni si necomuni luati la puterea cea mai mare