bantu ya kakak yang cantik :)
Penyelesaian
1. 3/7 - 2/8
= (3×8)/(7×8) - (2×7)/(8×7)
= 24/56 - 14/56
= 10/56
2. 2⅓ - 1½
= 7/3 - 3/2
= (7×2)/(3×2) - (3×3)/(2×3)
= 14/6 - 9/6
= 5/6
3. 5⅘ - 2⁷/4 + 1¼
= 29/5 - 15/4 + 5/4
= (29×4)/(5×4) - (15×5)/(4×5) + (5×5)/(4×5)
= 116/20 - 75/20 + 25/20
= 66/20
= 3⁶/20
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