(3.17+0.77:1,4)*3,5-4,216=
(3.17+0.77:1,4)*3,5-4,216= (3,17+0,55)*3,5-4,216= 13,02-4,216= 8,804
1)0,77:1,4=0,55
2)3,17+0,55=3,72
3)3,72*3,5=13,02
4)13,02-4,216=8,804