tolong di jawab 1 sampai 3 ya pakai caranya juga ya!!

1a) √169 + 14² ÷ 7² - 76
= 13 + 196 ÷ 49 - 76
= 13 + 4 - 76
= 17 - 76
= (-59)

b) 25² ÷ 5² + √1936 - 7²
= 625 ÷ 25 + 44 - 49
= 25 + 44 - 49
= 30

2a) 20 = 2² × 5
60 = 2² × 3 × 5
FPB = 2² × 5 = 20
kpk = 2² × 3 × 5 = 60

b) 45 = 3² × 5
75 = 3 × 5²
FPB = 3 × 5 = 15
kpk = 3² × 5² = 9 × 25 = 225

c) 80 = 2⁴ × 5
100 = 2² × 5²
120 = 2³ × 3 × 5
FPB = 2² × 5 = 20
kpk = 2⁴ × 3 × 5² = 1200

3) 3 lusin - 3 buah + ½ lusin
= (3 × 12) - 3 + (½ × 12)
= 36 - 3 + 6
= 39 buah

no 2 aja yah

a. 20=2²x5
60=2²x3x5
kpk=2²x3x5=60
fpb=2²x5=20
b. 45=3²x5
75=3x5²
kpk=3²x5²=225
fpb=3x5=15
c. 80=2x2x2x2x5
100=2²x5²
120=2³x3x5
kpk=2x2x2x2x3x5²=1.200
fpb=2x5=10