1、529.8 529.8 0.529.8 52000.098 50.9698 509.60.98 5096000.98 50.96980 三、估算。698198 904196 73399 20453 四、计算。6592.53.9 1.090.31.090.3 7 8 4 1 1 5.5 168 ( ) 4 5 3 7 8 8 5 1 1 ( ) 64902 7 4 2 10 288.35.27 64.30.68 8 1 3 6 1 3 7 2 4 7 5 2 8 1 1 4 3 37 37 3 9 4 2 7 7 33 7 1 9 1 ( ) 16 17 8 8 8 2 12.24684770
2、62.443146 四、解方程。 13 x 0.9 3 800x 18 7 x 5 1 55% x x 12 6 4 3 1 1 x : 9 = : 70 : x = 8 : 40 3 6 4 9 = 40 : x = 10 : 5 4.4 x 3 8 : 20 = x : 0.3 : x = 9 : 180 4 4 7 5 4 = = 5 x x 3 1 2 1 3 = : 5 = 7 3 2.4 x 1 1 1 : x 70 : x = 35 : 7 3 8 3 9514= 790480= 650= 6020= 51.8= 925= 2.10.7= 2020%= 9 3 3 9 1 3 7
3、 = 3 = = 4 4 5 8 2 2 6 6.492.74= 5.072.54= 12.516= 603= 二、根据31792449,直接写出下面各题的得数。310.79 0.310.79 31007900 317.9 24490.79 24.497900 244.90.79 2449000.79 697102 901296 57196 32143 5421.45.3 12.32012.320 8 7 4 1 1 2.5 75 ( ) 7 5 3 5 5 4 7 1 1 ( ) 72302 5 6 6 8 32802090 3099.8 5 1 8 1 1 5 6 2 7 7 4 1 9 1 1 2 15 6 6 2 10 3 4 17 17 22 1 6 8 1 ( ) 56 17 7 7 7 4 190385.4 60.53067 3 x 0.9 4 10x 110 2 x 3 1 10% x x 6 7 2 3 7 = : 6 : x = 0.2 : 9 4 6 14 6 = 0.8 : 6 2 40 : 40 = x : 4 : x = 90 : 150 3 4 2 1 5 x x 7 7 5 2 8 9 = 6 4 2 x x 0.4 :2 8 4 8819= 710530= 1040= 56040= 772= 519= 5.60.7= 3640%= 11 4 2