Question

* 5/4 - 4/3 x 12/5 = ?

* 2 + 3/5 {2/3+3 [ 7/6 - 1] } 8/5 = ?

Answer 1

*¹) 5/4 -4/3 x 12/5
5/4 -48/15 (mmc de 15 e 4, que da 60)
(75-192)/60
-117/60= -1,95

*²)2 + 3/5 {2/3+3 [ 7/6 - 1] } 8/5
2+3/5 {2/3+3[(7-6)/6]}8/5
2+3/5{2/3+3/6}8/5 (mmc de 6 e 3, que da 6)
2+3/5{(4+3)/6}8/5
2+3/5{7/6}8/5
2+21/30 x 8/5
2+168/150
2+1,12=3,12