Question

(24+78)*(-0,5)-(8-20):2

Answer 1

1) 24+78=102
2) 102*(-0,5)=-51
3) 8-20=-12
4) -12:2=-6
5) -51-(-6)=-45

Answer 2

5) там -51 - (-6) ... не деление)

Answer 3

(24+78) * (-0.5) - (8-20) :2=
= 102 * (-0,5)  -  (- 12) :2=
= -51 + 6 = -45

по действиям:
1) 24+78 = 102
2) 8-20 = -12
3) 102 * (-0,5) = -51
4) -12:2 =-6
5) - 51 - (-6) = -51+6 = -45