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=15 (7/8-6/8)
=15 1/8
21) luas permukaan kubus = 6 × s × s
= 6 × 25 ×25
=3750cm²
15 7/8 - 3/4 =127/8 -3/4 = 127/8 - 6/8 =
121/8 = 15 1/8
21. 6 x 25 x 25 = 3.750 cm2