Question

Calculați
a) (100 - 75) - [ 20 + 915 - 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

Answer 1

a) ( 100 - 75 ) - [ ( 20 + 915 - 70 ) - ( 88 - 18 + 40 ) ]
= 25 - ( 865 - 110 )
= 25 - 755 = - 730 ( nu am stiut unde incepe paranteza rotunda dupa cea patrata )

b) = 100 - [ 30 + (34 - 20 )+ 60 ]
   = 100 - ( 30 + 14 + 60 )
  = 100 - 104
   = - 4

c) = 22 - [ 22 - ( 22 - 18 + 58 - 40 ) ]
   = 22 - ( 22 - 22 )
   = 22

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

e) = [ 1200 - ( 800 - 700 - 600 )] - 400
   = [ 1200 - ( -500 ) ] - 400
  = ( 1200 + 500 ) - 400
  = 1700 - 400
  = 1300