v4.7199 1258.8 =4.7 (2001) =1250.811 =4.72004.71 =10011 =940- 4.7 =1100 =935.3 v253.2125 (20+1)0.63 =（250.4）（8125） =200.63+0.63 =101000 =12.6+0.63 =10000 =13.23v1040.25 7.2125 =(100+4) 0.25 =9(0.8125) =1000.25+40.25 =900 =25+1 =26v0.992.54 7.55-(1.36+0.55) =0.9910 =7.55-1.36-0.55 =9.9 =7.55-0.55-1.36=7-1.36v =5.64v8.810.2 5.810.1-5.8 =8.8 (10+0.2) =5.8 (10.1-0.1) =8.810+8.80.2 =58 =88+1.76 =89.763.212.5-12.52.4 5.27-3.99 =12.5(3.2-2.4) =5.27- 4+0.1 =12.50.8 =1.37 =1v672-3.6-6.4 848-269-131-48 =672-(3.6+6.4) =848-48-269-131 =672-10 =800-(269+131) =662 =800-400v =400v4.863+635.1+6.3 9.9+99.9+999.9 =(4.8+5.1+0.1) 63 =10+100+1000-0.3 =1063 =1110-0.3 =630 =1109.7v v4.7199 1258.8 v253.2125 (20+1)0.63v1040.25 7.2125 v0.992.54 7.55-(1.36+0.55)v8.810.2 5.810.1-5.8 3.212.5-12.52.4 5.27-3.99 v672-3.6-6.4 848-269-131-48v4.863+635.1+6.3 9.9+99.9+999.9