1、25= 20.46.03= 1.845=5.921.6 0.630.15 243.26.4 4.687.5= 0.5(20.75)1.6 10.734.765.24 39.86-(22.9+9.86 ) 7.42.431.437.4 三、求下面图形的总面积面积(厘米)练习33.9520.76 140.418 7.223.8= 108精确到百分位二、计算下面各题,能简便的要用简便方法计算 4.050.812.4 0.38940.25 4.023.024.026.98 0.625(8.73.7)三、计算下面每个图形的面积。练习44.32.14= 166.7= 8.367.4= 0.631.5=0.
2、452.85= 17.63.9= 12.542= 2.61.08= 0.910.70.1680.8 1.76(0.740.26)0.82.2(4.722.8)0.4 12.58 8 三、看图计算。1.计算下面图形的面积。(单位:厘米) 练习53.850.014 960.64= 8.686.2= 1040.52精确到百分位 6.2424= 92.525= 1325= 3.22.5=二、计算下面各题(能简算的要简算)4-3.251.30.7 1.288.60.288.6 6.81.256.88 4.252.5 1011.7 三、计算下面图形的面积。练习619.4412= 5.980.23= 5.4
3、0.015= 64.819 保留三位小数二、脱式计算(能简算的要简算)。 12.53.225 三、慎重审题,计算面积。1、计算下面各图形的面积。练习77.4+0.26= 10-0.26= 4.26.5= 0.752.630.780.52= 0.4220.5= 0.951.87= 1.5665= 二、计算:(9分) 8606020 (42060)(7545) 420(205198)410.781.542.46 2.723.985.282.02 8.44(5.442.8)三、(1)计算下面每个图形的面积。(8分) 练习81.080.05= 0.211.4 11.70.36= 0.5250.35=
4、0.7560.18= 2.04 24= 40.40.5= 2.61.08= 二、下面各题,怎样算简便就怎样算1.253.2 981.6 15.29+4.2+4.71+5.879.30.8-9.30.8 18.80.2(7.6-2.9)三.按要求计算。(1)求阴影部分面积。 (2)求组合图形面积。练习90.90.045= 6.210.03= 0.132.5= 917 精确到百分位二下面各题怎样算简便就怎样算。3.46.6+3.43.4 0.83.3712.5 6.8780(3.493.09) 4.57-1.32+2.43-0.68 (15.7-18.63.1) 0.6 8.52.51013.4三
5、、求阴影部分的面积 3.练习102.7+3.13= 78.92115.8= 32.08= 141.248.98=2.0424= 6.52.05= 0.7050.94= 7.50.24= 二、怎样简便怎样算。9.4+0.3-6.4 34.82(4.82+15.2) 73.81.6413.85.367.28(0.83.28) 3.151.836.852.17 13.862.99三、求下列图形的面积练习118.841.7 = 0.46101= 0.170.32= 7.80.13= 10.344.7 = 0.0820.15= 711 10.7512.5=精确到十分位二、简便计算:12.5 6.31.4
6、 2.95101-2.95 2.4 15.3244.680.25 2.551.51.56.451.5 练习123.259.04 = 3.258= 50.448= 1. 2118保留整数部分205.674= 9016.75= 3.56+7.5 = 15.3-6.09=5.84(1.340.14) 2.5573.81.6413.85.36 (9.6+1.483.7) 三、求阴影部分的面积(如右图)练习131.823= 26.40.063= 0.46515= 50.448= 0.861.2= 0.150.65= 9.720.027= 4.953.3= 6.75(0.93.75) 27.385.342.624.66 35.724.9(5.725.1) 6.734.8+5.26.73 8.40.6+8.40.4 15(0.150.4) 练习140.4480.28= 4.450= 7.26.25= 3.2520.8= 7.044.07= 3.5255= 1.8722.4= 179.264 =0.73-0.25-0.73+0.25 5.3+0.1+5.3-0.1 12.7-4.8-5.2 7.49.814.5 13.4+5.62+17.6+4.38 (81.4-3.75)2.54 3.123.1299
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