(1)解:原式=17-[-(8÷2)+[-(4×3)] =17-[-4+(-12)] =17-(-16) =33
| (2)解:原式=(--)×(-) =×(-)-×(-)-×(-) =-2+1+ =- |
(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 | |