Спримером 869. вычислите . б) (1 1/5+ 2 3/10): 1/2+( 6 3/4- 2 2/3): 1 1/6

1)1 1/5+2 3/10=6/5+23/10=12/10+23/10=35/10=3 5/10=3 1/5
2)6 3/4-2 2/3=27/4-8/3=81/12-32/12=49/12=1 1/12
3) 3 1/2:1/2=7/2:1/2=7/2•2/1=7
4) 1 1/12:1 1/6=13/12:7/6=13/12•6/7=13/14
5)7+13/14=7 13/14