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1、第6课时用计算器探索规律不夯实基础，难建成高楼。1.填表。单价(元)数量总价(元)牙膏3支28.5毛巾8.254块牙刷5把9.952 .在括号里填上适当的数。()X7= 11.55()X25= 810124X( )=460.0436X( ) = 4035.63 .用计算器，计算前四题，直接写出后三题的得数。(1)3 X4=3.3 X3.4 =3.33 X 33.4 =3.333 X 33 3.4 =3.3333 X 3333.4 =3.33333 X 33333.4 =3.333333X333333.4 =(2)81 +9=88.2+9=88.83+9=88.884+9 =88.8885 +
2、9=88.88886 + 9=88.888887 + 9 =4 .先找出规律，再填数。),3.1(1)1,1.1,1.3,1.6,(),(),(2)0.81,0.64,0.49,0.36,(3)3,1.5,0.75,0.375,(4)40,10,2.5,0.625,(重点又t点，一网打尽。5 .试一试，你会用计算器计算多步计算题吗?5.5+ 11X6.2X0.5X0.11X0.25 1-0.31 -0.5 X0.4 6 2.4 6 .根据333667X 3= 1001001填空，再用计算器检验。333667X 6= 333667X 9= 333667X 12= 333667X 18= 3336
3、67X 24= 333667X 27= 举一反三，应用创新，方能一显身手！7 .用计算器探索规律。(1)先用计算器算出前四个算式，再根据规律直接写出其他算式的得数。1X8+1=12X8+ 2 =123X8+ 3 =1234X 8+ 4 =12345X 8+ 5 =123456X 8+ 6 =1234567X 8+ 7=(2)用计算器算出下面算式的得数。532532+7=496496+7=532532+ 11=496496+11 =532532 + 13=496496+13=532532 +77=496496+77=532532+91 =496496+91 =532532 + 143=49649
4、6+ 143 =，直接写出结果。532532 + 1001 =496496+ 1001 =8.用计算器计算下面各题，并照样子再编三道题(10 1) +0.9 = (200 2) +0.9 =(3000 3) + 0.9 = (4000 4) +0.9 = 第 6 课时1. 9.533 1.992. 1.6532.43.71112.13. (1)1211.22111.2221111.222211111.22222111111.2222221111111.2222222(2)99.89.879.8769.87659.876549.8765434. (1)22.5(2)0.250.16(3)0.1875(4)0.156255. 0.53.11.550.1553.110 206. 20020023003003 400400460060068008008 90090097. (1)998987 9876 987659876549876543(2) 略8. 102203330 44440(500000 5) +0.9 = 555550(6000000 6) +0.9 = 6666660(70000000 7) +0.9 = 77777770
