1. 3/5=0,6
-1/4=-0,25
-2/3=-0,666...6=0,(6)
3/11=0,2727....27=0,(27)
-1 7/8=-15/8=-1,875
3 3/7=24/7=0,428571428571.....428571=0,(428571)
2.1/3-1/12=4/12-1/12=3/12=1/4=0,25
4/15+1/3=4/15+5/15=9/15=3/5=0,6
1/14+2/21=3/42+4/42=7/42=1/6=0,1666...6=0,1(6)
4/11*(2/3-1/6)=4/11*(4/6-1/6)=4/11*3/6=4/11*1/2=2/11=0,1818...18=0,(18)