Question

O valor da expressão [9/10 + (2/5 + 1/2) + 3/4 - 1] + 2/9 é:

Answer 1

[9/10 + (2/5 + 1/2) + 3/4 - 1] + 2/9 =
[9/10 + ( 4/10+5/10) + 3/4 - 1] + 2/9 = 
[9/10 + 9/10 + 3/4 - 1] + 2/9 = 
[18/10 + 3/4 - 1] + 2/9 =
[36/20 + 15/20 - 20/20] + 2/9 =
31/20 + 2/9 =
279/180 + 40/180 =
319/180

ou

9/10 + 2/5 + 1/2 + 3/4 - 1 + 2/9 =   (mmc= 180)
162/180 + 72/180 + 90/180 + 135 - 180/180 + 40/180 =
319/180