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45=3×3×5
70=2×5×7
90=2×3×3×5
fpb =5
6). kpk dari 28,36,42
28=2×2×7
36=2×2×3×3
42=2×3×7
kpk=2×2×3×3×7=252=04.12+07.18=11.30
7).fpb 54,48
54=2×3×3×3
48=2×2×2×2×3
2×3=6