2целых 4/15-4целых1/5 * (1целая5/6-41/42)=?

2 4/15- 4 1/5* ( 1 5/6- 41/42)= 2 4/15- 4 1/5*(11/6- 41/42)= 2 4/15- 4 1/5*( 77/42- 41/42)= 2 4/15- 4 1/5*36/42= 2 4/15- 21/5* 6/7= 2 4/15- 126/35= 2 4/15- 18/5= 2 4/15- 3 3/5= 2 4/15- 3 9/15= - 1 5/15= - 1 1/3

=34/15 - 21/5 *(11/6 - 41/42)=34/15 - 21/5 * 6/7=34/15 - 18/30=50/30=1целая 2/3