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2....12 per 36
3....8 per 15
4....3 satu per 10.(pec.campuran)
5....3 per 25
6....
2.2/8 + 4 / 5 = 8 x 5 = 40. 40 : 8 x 2 = 10
40 : 5 x 4 = 32 = 10 /40 + 32 / 40
10 + 32 = 42 / 40
= 1 2 / 40
= 1 1 / 20
3.6 / 9 - 2 / 4 = 36 : 9 x 6 = 24
36 : 4 x 2 = 18 = 42 / 36
= 1 6 / 36 = 1 1/6
4. 8 /10 x 8 / 12 = 8 x 8 = 64
10x2=120 = 64/120
=8/ 15
5. 3 1/2 x 20% = 3,5 x 0,2 = 7,0
6.40% x 0,3 = 0,40 x 0,3 = 0,12
7. 0,75 + 42,25 = 43,00