Solution: p=-2, q= 1.
When p=-2 and q= 1, the original formula =4-6+6-32-2=-30.
2.( 1) Original formula =-2x? - 1 1xy？
(2) The original formula =2x? +x-6
(3) The original formula =-a? b-ab
3.( 1) solution: original formula =-2a- quarter.
When a= half, the original formula =-5/4.
(2) solution: original formula = half xy+2
When x=2 and y= a quarter, the original formula = nine quarters.