1. 4/9; -0,2; -4/7; -1 1/12
2.
а)5/6-(-1 11/18-7/12)=3 1/36
1)-1 11/18-7/12=-1 22/36-21/36=-1 43/36=-79/36
2)5/6-(-79/36)=5/6+79/36=30/36+79/36=109/36=3 1/36
б)27/28:9/14+2 5/8*(-6/7)=-3/4
1)27/28:9/14=27/28*14/9=3/2
2)2 5/8*(-6/7)=21/8*(-6/7)=-9/4
3)3/2-9/4=6/4-9/4=-3/4