4 10/11(8/9-7/12)-9÷2 4/7=-2
8/9-7/12=32-21/36=11/36
4 10/11×11/36=54/11×11/36=54/36
=1 1/2
9÷2 4/7=9/1×7/18=7/2=3 1/2
1 1/2-3 1/2=-2