1. [-98? 76? (-87?)] ?2.
3.35?21?×8/2-(-6?)-59?4, 68×21-8-11×8-68×5
5. -2/9-7/9-56?6, 4.6-(-3/4 1.6-4? 3/4)
7.1/2 3 5/6-7/12 8. [2 /3-4-1/4×(-0.4)]/(1/3) 2?
9, 22? (-4?) (-2?) 4×3 10. -2 ×8-8?×(1/2) 8/(1/8)
11, (2/3 1/2)/(-1/12)-(-12) 12 , ( -28?)/(-6? 4?) (-1?)
13. (-2) 0/7-(-8)×(-2) 14. ( 1/ 4-5/6 1/3 2/3)/1/2
17. 0,25×(-4)-[4÷(-4/9) 1?] 18. 5? 1?-4×(3,7-1,2) 8]