1、3.61.22 6.83.62.6864 1.3182 1.25320.25 3.80.99 简便计算(2)4.699+4.6 7.5101-7.52.5(804) 4.647+4.654-4.6 7.682.50.4 0.4572+450.18+4.5 5.599 0.12572 0.48 9.51014.27.8+2.24.2 0.873.36+4.640.87简便计算(3)4.080.25 4900.355.2899 12.54.120.85.710.1 490.1258632.5 0.57.6200.34101 4.8699 4.9101 8.75 11-8.75 9.9 212 0.
2、68简便计算(4)3.26 5.7-3.260.7 55.699+55.61.25 2130.8 6.13.6+3.63.94.7599+4.75 2.73991.22.5+0.82.5 1010.450.254.784 0.652027.28.4+2.88.4 0.78984.80.25 1.5105 0.30.4简便计算(5)561.25 1.25+4.6+0.75 1.67.51.25498 0.49.6100.1 4210.2 9.80.5228.499+28.4 0.942.5-0.92.540.82.5 3.672 0.2539+0.25简便计算(6)3.20.82+3.21.18 1.5899+1.58100.22.5 14.5102 1.250.2512.15-3.83+0.85-6.17 2.651.7+1.351.73.550.40.4 0.1250.388018.6-18.60.5 3.583.6+6.43.583.050.254 4.254.25解方程(1)20-X=9 X-1.8=4 15-X=22.1X=3 X 7=0.3 1.6X=6.46X-35=13 3X-126=6 (5X-12) 8=24(100-3X) 2=8 6X+3=9 4X-2=10