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= 2×2/5×2
= 4/10 = 0,4
2. 9/20 = 9×5/20×5
= 45/100
= 0,45
3. 12/15 = 4/5 *diperkecil
= 4×2/5×2
= 8/10 = 0,8
4. 7/8 = 7×125/8×125
= 875/1000 = 0,875
5. 17/25 = 17×4/25×4
= 68/100 = 0,68