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= 13/4 - 3/2 + 3/4
= 13/4 - 6/4 + 3/4
= 7/4 + 3/4
= 10/4
= 2 2/4
= 2 1/2 kg
3. 3/4 : 21% × 1,5
= 3/4 : 21/100 × 15/10
= 3/4 × 100/21 × 15/10
= 300/84 × 15/10
= 4500/840
= 4500:15/840:15
= 153/56
= 2 41/56
4. A : B = 3 : 4
B : C = 2 : 5
A = 3
B = 4/2 × 2
= 2 × 2
= 4
C = 4/2 × 5
= 2 × 5
= 10
A : B : C = 3 : 4 : 10
5. skala = jarak peta : jarak sebenarnya
= 9 cm : 72 km
= 9 cm : 7200000 cm
= 1 : 800000
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