yang tau no 1 sampai 4 tolong di jawab

Nomer 1

42+8×10-6 = 42+80-6
= 122-6
= 116

4). 24 = 2³x3
40 = 2³x5
56 = 2³x7
kpk = 2³x3x5x7 (a)

2). (-125):(-5)+20x8-(-12)
= 25 +160-(-12)
= 25 + 172
= 197 (d)