1解:原式=17-8-2-12
=-5
2解:原式=1+3
=4
3解:原式=18+3×{-1/3}
=18-1
=17
4解:原式=6÷1/6
=36
5解:原式=11/5×[-1/6]×3/11÷5/4
=-2
6解:原式=9/4×[-6/7]÷[-2/3]
=63/16
7解:原式=-2×9+18
=0
望采纳
1.9 2.4 3.17