Надо сделать ! ! 5 1/6: 31+(3 1/4+2 1/6): 2 3/5-2/3: 4/9

(31/6)/31+((13/4+13/6)/(13/5))-(2/3/(4/9))=0.749

5ц.1/6*1/31=1/6
3ц.1/4+2ц.1/6=13/4+13/6=39/12+26/12=65/12
65/12:2ц.3/5=65/12*5/13=25/12
2/3:4/9=2/3*9/4=3/2
1/6+25/12+3/2=2/12+25/12+18/12=45/12=15/4=3ц.3/4