1用简便方法计算0.250.28 0.1253.22.5 3540.2 3.59.9 3.599+3.5 3.5101-3.5 3.59.9+3.50.1 3.52.7+350.73 3.52.7-3.50.7 3.290.254 0.1258.8 2.52.4 0.351.2520.8 32.40.9 3.610228.610128.6 0.8615.70.8614.7 2.4102（2.50.25）0.4 9.161.50.59.16 3.63.60.57.60.80.27.6 0.85199 0.258.54 0.2536 0.1253.22.5 3540.23.723.56.283.5 4.87.8780.52 (1.250.125)8
