(1,578+0,172)×(0,823+0,177)-5: (4,418-3,418)=?

1.75*1-5/(1) = 1.75-5 = -3.25

(1,578 + 0,172) * (0,823 + 0,177) - 5: (4,418 - 3,418) = -3,25
1) 1,578 + 0,172 = 1,75
2) 0,823 + 0,177 = 1
3) 4,418 - 3,418 = 1
4) 1,75 * 1 = 1,75
5) 5:1 = 5
6) 1,75 - 5 = -3,25