Tolong dijawab dng caranya ya

a.15 ab=3 x 5 x a x b
   20 ab=2² x 5 x a x b
FPB =5 x a x b = 5ab
KPK =2² x3 x 5 x a x b =60ab


b.10a²b³c = 2x5 x a² x b ³ x c
   15b²c²d =3x5 x b² x c² x d
FPB= 5 x b² x c = 5b²c
KPK=2x3x5 x a² x b³ x c² x d =30a²b³c²d


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