(1)解:原式=17-[-(8÷2)+[-(4×3)] =17-[-4+(-12)] =17-(-16) =33
| (2)解:原式=( - - )×(- ) = ×(- )- ×(- )- ×(- ) =-2+1+![](http://img.shitiku.com.cn/uploads/allimg/20190816/20190816011237-21140.gif) =-![](http://img.shitiku.com.cn/uploads/allimg/20190816/20190816011237-70652.gif) |
(3)原式=-9-9×(-2)-[(-2)×1] =-9+18+2 =21 | (4)原式= -9× ×[25×(- )-(-60)× ] =-3×[-15+15] =-3×0 =0 |
(5)原式=[50-( - + )×36]÷49 =[50-( ×36- ×36+ ×36)]÷49 =[50-(28-33+6)]÷49 =(50-1)÷49 =49÷49 =1 | |