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4xy = 2² x X
6x² = 2 x 3 x X²
KPK = 2² x 3 x X² = 12x² (D)
nomer 9
20 a²b³c² = 2² x 5 x a² x b³ x c²
24 a³b²c = 2³ x 3 x a³ x b² x c
FPB = 2² x a² x b² x c = 4a²b²c (A)
nomer 10
ilai x = 9
panjang = 2x + 4 = 2(9) + 4 = 22 cm
lebar = x - 1 = 9 - 1 = 8 cm (A)