tentukan KPK dari tiga bilangan berikut ! 11. 84,168,dan210 12. 78,117,dan156 13. 112,168dan224 14. 105,210,dan315 15. 144,192,dan288

11. 86 = 2 × 43
168 = 2³ × 3 × 7
210 = 2 × 3 × 5 × 7
Kpk = 2³ × 3 × 5 × 7 × 43
= 8 × 3 × 5 × 7 × 43
= 36.120

12. 78 = 2 × 3 × 13
117 = 3² × 13
156 = 2² × 3 × 13
Kpk = 2² × 3² × 13
= 4 × 9 × 13
= 468

13. 112 = 2⁴ × 7
168 = 2³ × 3 × 7
224 = 2 pangkat 5 × 7
Kpk = 2 pangkat 5 × 3 × 7
= 32 × 3 × 7
= 672

14. 105 = 3 × 5 × 7
210 = 2 × 3 × 5 × 7
215 = 3² × 5 × 7
Kpk = 2 × 3² × 5 × 7
= 2 × 9 × 5 × 7
= 630

15. 144 = 2⁴ × 3²
192 = 2 pangkat 6 × 3
288 = 2 pangkat 5 × 3²
Kpk = 2 pangkat 6 × 3²
= 64 × 9
= 576