Question

1. Calculati:
A)(100-75)-[20+(15-70)-(88-18+40)]
b)100-{30+[(88-54)-(400-380)]+60}
c)22-{22-[22-(40-22)+(88-22)-(88-40)]}
d)400-{[23-(123-100)]-59+(-259+100)+10}
e){1200-[800+(-1450+750)-(390+210)]}-400
f)1-{2+(3-4)-[6-(7-8)+(9-10)]-11}+12

Answer 1

a) (100-75)-[20+(15-70)-(88-18+40)]
=25-(20+-55-110)
=25-(-75-100)
=25--25
=-0

b) 100-{30+[(88-54)-(400-380)]+60}
=100-[30+(34-20)+60]
=100-(30+14+60)
=100-104
=-4

c) 22-{22-[22-(40-22)+(88-22)-(88-40)]}
=22-[22-(22-18+66-48)]
=22-(22-22)
=22-0
=22

d)400-{[23-(123-100)]-59+(-259+100)+10}
=400-[(23-23)-59+-159+10}
=400-(0-59+-159+10)
=400--110
=-290

e){1200-[800+(-1450+750)-(390+210)]}-400
=[1200-(800+2200-600)]-400
=(1200-2400)-400
=-1200-400
=-1600

f) 1-{2+(3-4)-[6-(7-8)+(9-10)]-11}+12
=1-[2+-1-(6--1+-1)-11]+12
=1-(2+-1--6)-11+12
=1--3-11+12
=-2-11+12
=-13+12
=-1