3/4+0,7-1/10=3/4+7/10-1/10=15/20+14/20-2/20=27/20
27/20*2 2/9=27/20*20/9=3
3:0,25=3:25/100=12
1.3\4+0,7=3/4+7\10= 1 9\20
2. 1 9\20-1/10= 1 7/20
3. 1 7\20*2 2\9=3
4.3:0,25=12
3/4+0,7-1/10=3/4+7/10-1/10=15/20+14/20-2/20=27/20
27/20*2 2/9=27/20*20/9=3
3:0,25=3:25/100=12
1.3\4+0,7=3/4+7\10= 1 9\20
2. 1 9\20-1/10= 1 7/20
3. 1 7\20*2 2\9=3
4.3:0,25=12