I cant figure this out

6 /2 * 8-8 /2

i got
6/2 * 8-8 /2
3*8 4
24 -4
= 20

is this right way?

29 - (3+5) *2 +3
i got 16 is that right?

5-[6+3(-40/8) + (-2)exponent 2
i got 9 x5 = 45 + 4
= 5 -49
= -44
is that correct?

yes