Question

Calculati: a) (39+1):[(70:7+3)-(64:8-3)]*6-12= b) [(379+156)-(279+184)]:8+6:6 c) {[1000-453-(154+8*9)]:3-7}:10= d) [(19+16:2):3*4-(42-12):5]:10*8=

Answer 1

a)40;(13-5)*6-12=40:8*6-12=30-12=18
b)(535-463):8+1=9+1=10
c)(547-226):3-7=321:3-7=107-7=100
d)(27:3*4-30:5):10*8=30:10*8=24