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a = 1/10, 1/2, 1/9, 1/4, 1/8
1/4 = 0,25
1/9 = 0,11
1/8 = 0,125
1/10 = 0,1
1/2 = 0,5
b. = 2/4, 1/9, 1/3, 3/4, 1/6
3/4 = 0,75
2/4 = 0,5
1/6 = 0,167
1/9 = 0,11
1/3 = 0,33
c. = 1/5, 1/2, 1/9, 1/4, 2/3
2/3 = 0,67
1/2 = 0,5
1/9 = 0,11
1/4 = 0,25
1/5 = 0,2
No. 2 Pake pohon faktor:
20 =2 x 10
10 = 2 x 5
25 = 5 x 5
40 = 2 x 20
20 = 2 x 10
10 = 5 x 5
20 = 2² x 5
25 = 5²
40 = 2² x 5²
KPK = 2² x 5²
= 4 x 25
= 100
FPB = 2² x 5
= 4 x 5
= 20