Bantu dong......nanti aku follow Dan aku like yang jawabannya perfect aku jadiin brainly answer.pake Cara ya......................

1.
a)
-56+((-48):(-4))-20
= -56+12-20
= -44-20
= -64

b)
120+(-68)-(8x(-6))
= 120-68-(-48)
= 120-68+48
= 52+48
= 100

c)
150x((-120):(-40))-125
= 150x3-125
= 450-125
= 325

2.
a)
60 = 2² x 3 x 5
80 = 2^4 x 5
KPK = 2^4 x 3 x 5 = 16 x 3 x 5 = 240
FPB = 2² x 5 = 4 x 5 = 20

b)
32 = 2^5
48 = 2^4 x 3
KPK = 2^5 x 3 = 32 x 3 = 96
FPB = 2^4 = 16

c)
42 = 2 x 3 x 7
56 = 2^3 x 7
KPK = 2^3 x 3 x 7 = 8 x 3 x 7 = 168
FPB = 2 x 7 = 14


3.
a) 04.30
b) 13.45
c) 16.10
d) 20.00

4.
2 = 2
3 = 3
4 = 2²
KPK dari 2, 3, dan 4 = 2² x 3 = 4 x 3 = 12
maka,
ketiga lampu menyala bersamaan pd detik ke-12


5.
1 jam 45 menit
= 1 3/4 jam
maka,
jarak
= kecepatan x waktu
= 45 km/jam x 1 3/4 jam
= 45 x 7/4 km
= 78,75 km
atau jika dibulatkan
= 79 km