Question

5•2-1•5= 14+4•3-5= 12+7-4•6= 78-24+13•5=

Answer 1

5*2-1*5=5
14+4*3-5=36
12+7-4*6=5
78-24+13*5=119
65+54=119

Answer 2

Let's solve each expression step by step:

5•2-1•5= (5 x 2) - (1 x 5) = 10 - 5 = 5

14+4•3-5= 14 + (4 x 3) - 5 = 14 + 12 - 5 = 21

12+7-4•6= 12 + 7 - (4 x 6) = 12 + 7 - 24 = -5

78-24+13•5= 78 - 24 + (13 x 5) = 78 - 24 + 65 = 119

Therefore: 5•2-1•5=5 14+4•3-5=21 12+7-4•6=-5 78-24+13•5=119