1用简便方法计算:2310.2 4310.5 2610.7349.2 219.9 569.63519.2 +35 20.8 6456.5+64 43.5 3.519 +3.5 0.6499+0.64 2619.8- 26 9.8 5866.5-58 16.5 8.921- 8.9 23.5101-23.5 25 9.8 0.4 125 9.2 0.820.025 32 1.25 125 0.5625 1.2 12.5 32 2.5 2827-3.7-17.3 56.8-32.5-18.5 28.9-12.3-8.954.6-23.7-14.6 78.1-23.9+14.9 123.5-57.8+14.30.25 0.7 4 2.5 0.9 2 3.25 0.5 61.25 1.3 0.8 12.7 0.4 50 2.25 0.126 2810.4 4510.8 779.5
