4*4+1/2(6+8)*8-1/2(4+6+8)*4=36
1/2*10*10*1/2-1/2*4*4=17
6*6-1/2*2*6-1/2*6*3-1/2*3*4=15 6*6-1/2*2*2-1/2*4*2-1/2*4*5-1/2*1*4=18
4*4+1/2(6+8)*8-1/2(4+6+8)*4=36
1/2*10*10*1/2-1/2*4*4=17
6*6-1/2*2*6-1/2*6*3-1/2*3*4=15 6*6-1/2*2*2-1/2*4*2-1/2*4*5-1/2*1*4=18