1、1.61.6调查“生活垃圾” 调查“生活垃圾” 1 1、填一填 (1)计算 6.53.54 时,应先算( )法,再算( )法 (2)3.54.21.8 的运算顺序是( ) (3)计算 5.6(287.6)0.15 时,应先算( )法,再算( )法,最后算( )法 (4)把 1.540.311.23,1.281.230.05,8.40.050.42 列成综合算式是( ) 2 2、先说一说运算顺序,再进行计算。 37(2.634.77) (4.10.35)0.5 0.490.070.2 1.60.40.04 3 3、把结果相等的两个算式连一连 4 4、直接写得数 5.6100 10.82 12.5
2、8 3.540.1 2.151.85 06.25 7.85.1 16.93.026.9 7.23.52.8 2.542.54 5 5、脱式计算,能简算的要简算 41.29941.2 12.82.80.5 (2.58)4 0.56(991) 1.250.68 2.5484 9.650.330.67 1.2580.6 990.560.56 9.65(0.330.67) 0.0310.01 30.311.069.94 6 6、填一填,说一说 (1)小数混合运算的顺序与整数混合运算的顺序( ) (2)计算 4.244.244 时,先算( ) ,再算( ) ,结果是( ) (3)计算 9.6(21.84
3、)时,应先算( ) ,再算( ) ,结果是( ) 7 7、下面的计算对吗?若不对,请改正 (1)7257572575 800800 0( ) (2)4.20.54.20.5 2.12.1 1( ) 8 8、计算下面各题 6.480.125.4 9.3691.8 9.7283.26.4 39.057.14.02 9 9、用适当的方法计算下列各题 80.420.41.2 2.10.62.5 0.486(5.33.8) 6.2(6.22) 1010、找规律填空。 (1)1.2390.0411.11 12.3490.05111.11 123.4590.061111.11 ( )9( )( ) ( )9
4、( )( ) (2)11061 106 4 21062 2012 8 31063 ( )( ) ( ) ( )106( ) ( )( ) ( ) 1111、计算下面各题 5.880.60.21 20.69.030.86 631.43.6 19.442.740.8 0.256.4740 (4.80.54)0.6 12、计算下面各题,能简算的要简算 2.81.64.2 2.5530.4 0.480.70.520.7 28.610128.6 (80.8)0.125 3.80.90.38 1.25253.2 6.73.30.42 答案答案 1 1、 (1)乘,加; (2)从左到右依次计算; (3)加,
5、乘,减; (4)8.41.281.540.310.42 2 2、5,8.9,1.4,16 3 3、 4 4、0.056 0.18 100 0.354 4 0 2.7 6.98 13.5 16 5 5、41.29941.2 =41.2(99+1) =4120 12.82.80.5 =12.81.4 =11.4 0.0310.01 =0.03(10+0.01) =0.3+0.0003 =0.3003 30.311.069.94 =30.3(11.06+9.94) =30.321 =9.3 6、 (1)一样(2)除法 减法 3.18 (3)减法 除法 60 7、 (1) 改正:725+75-725-
6、75 =725-725+5+75 =150 (2) 改正:4.20.54.20.5 =4.24.20.50.5 =0.25 8 8、10 46.8 9.44 1.48 9 9、80.420.41.2 2.10.62.5 =80.417 =3.52.5 (2.58)4 0.56(991) 990.560.56 1.250.68 9.650.330.67 9.65(0.330.67) 1.2580.6 2.5484 =63.4 =1.4 0.486(5.33.8) 6.2(6.22)6.2(6.22) =0.4861.5 =6.26.2 2或 =6.23.1 =0.324 =2 =2 10、 (1
7、)1234.56,0.07,11111.11,12345.67,0.08 111111.11 (2)30,18,12,4,4,40,24,16 1111、16.8 10.1 12.5 48 64.7 8.9 12、2.81.64.2 =4.48+4.2 =8.68 2.5530.4 =153 =53 0.480.70.520.7 =0.7(0.48+0.52) =0.71 =0.7 28.610128.6 =28.6(100+1)28.6 =2860+28.628.6 =2860 (80.8)0.125 =80.125+0.80.125 =1.1 3.80.90.38 =3.8(0.9+0.1) =3.8 1.25253.2 =( 1.250.8) (42.5) =10 6.73.30.42 =6.7+1.386 =8.086