（1）原式=0.55-0.55

                =0（2）原式=3.51-1.04

                =2.47

（3）原式=5.8-1.65

                = 4.15（4）原式=0.49+6.42

                =6.91

（5）原式=1300×2

                =2600（6）原式=9.47-2.47

                =7

（7）原式=60.75-8.55

                =52.2（8）原式=7.71+1.5

                =9.21