117/18*(1 59/70 + 37/42+ 2 19/30)- 10 по действиям

     =5/12

1)   1 59/70+37/42+2 19/30=1 354/420+370/420+2 266/420=5 150/420=5 5/14

2)   1 17/18 * 5 5/14=35/18 * 75/14=125/12=10 5/12

3)  10 5/12 - 10=5/12