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b = 2
c = -5
-3ac + 5bc + abc
-3(-4)(-5) + 5(2)(-5) + (-4)(2)(-5)
12(-5) + 10(-5) + (-8)(-5)
-60 + (-50) + 40
-60 - 50 + 40
-110 + 40
-70
Jawaban-Nya yang D. -70
-3ac+5bc+abc = -60 + (-50) + 40 = -110 + 40 = -70
nilai yg bervariabel hanya perlu diganti dengan angka yg sudah ditentukan