Question

Determine o valor da expressão numérica:
1 - [- 2/5 - ( -1/2+3/4) - 0,5]

Answer 1

1-[-2/5-(-2+3/4)-1/2]
= 1-[-2/5-(1/4)-1/2]
= 1-[-2/5-1/4/-1/2]
=1-[-8-5-10/20]
= 1-[-23/20]
=1+23/20
= 20+23/20
= 43/20