Question

7. Calcule o valor das expressões:
a) 70 – [ 12 + ( 5 x 2 – 1 ) + 6 ]

b) 8 : 2 + [ 15 – ( 4 x 2 + 1 ) ]

c) 9 + [ 4 + 2 x ( 6 – 4 ) + ( 2 + 5 ) ] – 8

d) 50 + { 10 – 2 x [ ( 6 + 4 : 2 ) – ( 10 – 3 ) ] }

Answer 1

a) ) 70 – [ 12 + ( 5 x 2 – 1 ) + 6 ]

70 - [12+ (10 - 1) + 6]

70 - [ 12 + 9 + 6]

70 - [ 21 + 6]

70 - 27

R= 43

b) 8 : 2 + [ 15 – ( 4 x 2 + 1 ) ]

8 : 2 + [15 - (8 + 1) ]

8 : 2 + [ 15 - 9 ]

8 : 2 + 6

4 + 6

R= 10

c) 9 + [ 4 + 2 x ( 6 – 4 ) + ( 2 + 5 ) ] – 8

9 + [ 4 + 2 x 2 + 7] - 8

9 + [4 + 4 + 7] - 8

9 + [ 8 + 7 ] - 8

9 + 15 - 8

24 - 8

R= 16

d) 50 + { 10 – 2 x [ ( 6 + 4 : 2 ) – ( 10 – 3 ) ] }

50 + { 10 - 2 x [ ( 6 + 2) - 7 ] }

50 + { 10 - 2 x [ 8 - 7 ] }

50 + { 10 - 2 × 1 }

50 + { 10 - 2 }

50 + 8

R= 58