15=3x5
45=3²x5
(15,45)=3x5=15
[15,45]=3²x5=45
b)13=13x1
36=2²x3²
(13,36)=1
[13,36}2²x3²x13=468
c)42=2x3x7
54=2x3³
(42,54)=2x3=6
[42,54]2x3³x7=378
d) 32=2⁵
16=2⁴
48=2⁴x3
(32,16,48)=2⁴=16
[32,16,48]=2⁵x3=96
e)20=2²x5
30=3x2x5
40=2³x5
(20,30,40)=2x5=10
[20,30,40]=2³x3x5=120
f) 126=2x3²x7
162=3⁴x2
270=2x5x3³
(126,162,270)=2x3²=18
[126,162,270]=2x3⁴x5x7=5670
