1、在括号里填上 或 =0.8 8.2 ( ) 8.2 72.5 5.8 ( ) 198.7 0.65 ( ) 98.7 7.4 1.2 ( ) 7.41.8 5.8 ( ) 1 3.76 5.8 ( ) 3.762.8 8.2 ( ) 8.2 0.03 0.1 ( ) 119.3 5.8 ( ) 1 3.4 11.2 ( ) 11.216.2 0.9 ( ) 16.2 3.8 2.7 ( ) 191 5.8 ( ) 91 0.02 1.9 ( ) 1.912.5 0.7 ( ) 12.5 0.05 0.07 ( ) 11.3 2.1 ( ) 1 8.4 4.8 ( ) 8.41.6 18.4 (
2、 ) 18.4 1.5 3.1 ( ) 10.03 10.4 ( ) 0.03 0.86 0.31 ( )0.8625 34.3 ( ) 1 0.7 11.4 ( ) 11.432.8 1.4 ( ) 32.8 78 4.3 ( ) 780.6 0.31 ( ) 1 0.8 2.4 ( ) 2.40.9 1.4 ( ) 1.9 1.4 9.7 0.34 ( ) 9.7 0.348.6 1.4 ( ) 8.2 1.4 98 0.34 ( ) 99 0.3467 1.4 ( ) 3.6 1.4 0.9 1.4 ( ) 0.9 1.41.9 3 ( ) 1.9 0.4 67 1.4 ( ) 67 4
3、.13.4 0.87 ( ) 0.87 9.9 0.86 ( ) 0.860.98 1.4 ( ) 1.4 9.4 1.2 ( ) 1.20.99 0.87 ( ) 1 1.6 1.07 ( ) 12.11 0.99 ( ) 0.99 2.4 3.5 ( ) 0.24 356.7 2.5 ( ) 0.67 2.5 12.7 20.5 ( ) 127 0.205在括号里填上适当的数67.9 0.06 = 6.79 ( ) 7.5 0.06 = 750 ( )0.069 ( ) = 69 5 87.34 1.57 = ( ) 15.737.3 0.06 = 3.73 ( ) 29.8 0.06 =
4、 ( ) 600.09 7.29 = 90 ( ) ( ) 271.7 = 4.63 2717( ) 7.29 = 90 729 168 0.06 = 0.168 ( )计算6.78 12.1 + 2.2 6.78 + 6.78 5.7 =9.2 8.1 1.1 9.2 + 3 9.2=125 19.1 125 5.1 - 6 125=125 2.1 + 12 12.5 + 1.25 470=9.876 2.1 + 98.76 0.79=3.274 18.5 327.4 0.085=125 21.1 - 12510.1 125=68.23 100.1 19.87 99.9 = =125 88.
5、08 25 40.04= =比较 A、B、C 大小A 0.9 = B 0.9 = C 0.2A 0.2 = B 1.3 = C 2A 1.9 = B 0.9 = C 0.22 A = 0.9 B = 20 C1.9 A = 3.8 B = 0.5 C口算30 0.7 = 21.4 5 = 3 91 = 4.3 0.2 =80 3.1 = 12.3 0.3 = 8.3 0.2 = 7.81 3 =6.08 0.6 = 3 7.81 = 0.6 6.08 = 1.5 4 =1.2 5 = 3.1 0.5 + 0.2 = 7-2 4 =7-1.5 4 = 8.4 0.6 = 9.3 0.3 =13.
6、8 - 1.9 - 0.1 = 56.2 0.6 + 0.4 56.2 =98.35 0.6 + 4 9.835 = 3.7 0.06 =0.5 3.61 2 = 9.1 101 9.1 =2.5 8.69 4 = 0.35 98 0.7 =0.12 2 = 12 24 = 0.92 4.6 = 0.3 0.06 =3.6 0.9 = 0.3 0.15 = 77 0.7 = 14.7 70 =75.6 90 = 0.63 30 = 6300 0.03 = 3 0.3 =8.2 0.01 = 3.2 1.6 - 0.6 = 3.8 0.0001 =10 - 0.6 0.1 = 2.14 2 +
7、0.03 = 6.67 2.89 2.89 =500 25 4 = 3.5 0.8 0.8 = 2400 25 4 =68 1.25 0.8 = 629 25 4 = 94 2.3 48 2.3 =1.5 7 + 8.5 7 = 7.8 + 7.8 7.8 = 3.62 2.9 3.62 =3.8 4 + 5 4 = 760 8 - 600 8 = 60 4 + 60 2 = 90 4 + 90 5 =1.75 80 + 2.25 80 = 1.6 + 2.4 3 = 9.9 2.7 + 0.27 =27.8 2.5 27.8 = 1.25 5.4 0.8 = 7 0.5 2 =10 1.25 8 = 2.6 21 - 2.6 20 =8.4 21 8.4 20 = 80 125.125 =6.4 8 3.2 = 7.42 + 8.29 - 3.42 =(9.2 + 1.6 ) 2 2 = 4.98 11 11 =3.19 101 3.19 = 0.25 9 0.25 5 =7.5 1.5 3 = 13.4 0.4 13.4 0.4 = a a = 1 x y = 1 x = 2.5 (a 4 ) =y 5 4y = 6m 3m -2m = 20 5a 3a =2n 1.5 + n = 解方程800 x = 40 x9 2 = 30 3 + 5x = 8
