Пошаговое объяснение:
2)10 7/9-2,5*1 1/6 =7 31/36
2,5*1 1/6=5/2*7/6=35/12=2 11/12
10 7/9-2 11/12=10 28/36-2 33/36
=7 31/36
3)8 1/2:5 2/3+19,7 =20 1/30
8 1/2:5 2/3=17/2*3/17=2/3
2/3+19,7=2/3+19 7/10=20/30+19 21/30=20 1/30
4) 7 1/4*35/58:5 5/6=3/35
7 1/4*35/58=29/35*35/58=1/2
1/2:5 5/6=1/2*6/35=3/35
Пошаговое объяснение:
2)10 7/9-2,5*1 1/6 =7 31/36
2,5*1 1/6=5/2*7/6=35/12=2 11/12
10 7/9-2 11/12=10 28/36-2 33/36
=7 31/36
3)8 1/2:5 2/3+19,7 =20 1/30
8 1/2:5 2/3=17/2*3/17=2/3
2/3+19,7=2/3+19 7/10=20/30+19 21/30=20 1/30
4) 7 1/4*35/58:5 5/6=3/35
7 1/4*35/58=29/35*35/58=1/2
1/2:5 5/6=1/2*6/35=3/35