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Jawab:
Penjelasan dengan langkah-langkah:
1. 1/4 x 0,72 = 1/4 x 72/100 = 72/400 = 9/5
2. 85% : 8/15 = 85/100 : 8/15 = 1275/800 = 51/32
3. 30 + 0,25 x 5% - 3 1/2 : 1/5
= 30 + 1/4 x 1/20 - 7/2 :1/5
= 30 + 1/80 - 35/2
= 2400/80 + 1/80 - 1400/80
= 101/8
4. 40% x 4 1/2 - 0,6 + 10 : 1/2
= 2/5 x 9/2 - 6/10 + 100/10 : 1/2
= 18/10 - 6/10 + 50/10
= 62/10
= 31/5
5. 4 3/8 : 1,5 : 3/4
= 35/8 : 15/10 : 3/4
= 35/8 x 10/15 x 4/3
= 1400/360
= 35/9
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