Question

me ajd calcule o valor das expressões

Answer 1

[(3/4 - 3/5 + 3/2) + 2] - 3 =
= [(15/20 - 12/20 + 30/20) + 2] - 3 =
= [33/20 + 2] - 3 =
= 73/20 - 3 =
= 13/20


[9/2 + 3/4 - (3/5 - 5/4] - 1 =
= [9/2 + 3/4 - (12/20 - 25/20] - 1 =
= [90/20 + 15/20 -(-13/20)] - 1 =
= [105/20 + 13/20] - 1 =
= 118/20 - 1 =
= 98/20