Question

a) (36:4+4x6+8:2+2):[(36:4+3x13)-3x10-15]=
b) 120-40:8x [424:4-113:3+(256+46:2):3]:10=

Answer 1

(36:4+4x6+8:2+2):[(36:4+3x13)-3x10-15]=(9+24+4+2):[(9+39)-30-15]
43:(48-30-15)
43:3=14,rest 1 
b] 120-40:8x[424:4-113 :3+(256+46:2):3]:10=
120-5x[106-114;3+(256+23):3]:10
120-5x(106-38+279:3):10
120-5x(106-38+93):10
120-5x(68+93):10
120-5x1564:10
120-7820:10
120-782
782-120
662