Question

1.Calcule o valor das expressões: a) 27+{45-[12+(6-3)]+7} b) 10 - 12 - 7 c) 70+{12-[120-20]}​

Answer 1

a) 27 + {45 - [ 12 + ( 6 - 3 ) ] + 7 }

= 27 + [45 - ( 12 + 3 ) + 7 ]

= 27 + ( 45 - 15 + 7 )

= 27 + ( 30 + 7 )

= 27 + 37

= 64

b) 10 - 12 - 7

= 10 - 19

= - 9

c) 70 + { 12 - [ 120 - 20 ] }

= 70 + ( 12 - 100 )

= 70 + ( - 88 )

= 70 - 88

= - 18