4,45:(12,45-4,45)+16,21*1 3/4=
1) 12,45-4,45= 8
2) 4,45:8=89/160
3) 16,21*1 3/4=28 147/400
4) 89/160+28 147/400=28 739/800
4,45:(12,45-4,45)+16,21*1 3/4=
1) 12,45-4,45= 8
2) 4,45:8=89/160
3) 16,21*1 3/4=28 147/400
4) 89/160+28 147/400=28 739/800