2-( 1 11/30-1,7)*1 2/7 / 1 13/14

=2-(41/30-17/10)*(9/7)/ (27/14)=2-(41/30-51/30)*(9/7)*(14/27)= 2-(-10/30)*(2/3)=2-((-1/3)(2/3))=2+2/9=2 2/9