3/5-1/3-2/9 дробная черта 7/15+2/3-4/5=?

3    1      2         27-15-10         2__ - ___ -___=___________=____5      3       9           45              457       2        4         7+10-12                   4__+ ___ -____ =_____________=___________15     3       5               15                        15    (2/45)/(4/15)=2/45*15/2=1/6