Пошаговое объяснение:
1) 3 1/14-2 5/21=3 3/42-2 10/42=35/42
=5/6
2,7-2,1=0,6
5/6*0,6=5/6*6/10=1/2.
2) 4 13/18-3 7/9=4 13/18-3 14/18=17/18
1/2-4/17=17/34-8/34=9/34
17/18*9/34=1/4
Пошаговое объяснение:
1) 3 1/14-2 5/21=3 3/42-2 10/42=35/42
=5/6
2,7-2,1=0,6
5/6*0,6=5/6*6/10=1/2.
2) 4 13/18-3 7/9=4 13/18-3 14/18=17/18
1/2-4/17=17/34-8/34=9/34
17/18*9/34=1/4