Tolong saya........ Sangat penting

a.b=20.(-15)=-300
b.c=-15.(-5)=75
-300/75=-4
jadi jawabannya=a.-4
semoga bermanfaat

a × b
____
b × c
= 20× -15
______
= -15×-5
= -300
___
75
= -4