_5,0 | 9
45 0,5555....
50
45
...
5/9 = 0,(5)
_13,0 | 99
99 0.131313...
_310
297
_130
99
31
....
13/99 = 0,(13)
77-18÷3×5+21=26
1.18÷3=6
2.6×5=30
3.30+21=51
4.77-51=26