1、0.193100 1.931 1931 190003100 58900.31 58.90.31 5.89310 5.8931 三、估算。797297 698102 57397 63369 四、计算。7335.83.7 11.40.711.40.7 13 9 8 1 1 4.5 140 ( ) 6 5 7 4 5 9 9 1 1 ( ) 99398 8 8 4 10 18682.74 82.87.2 4 1 1 1 1 9 5 4 7 6 7 2 7 1 4 2 15 43 43 3 8 2 5 17 17 35 1 2 9 2 ( ) 48 19 3 3 8 3 1548439.19 72.4
2、35291 四、解方程。 9 x 0.1 9 40x 26 8 x 5 1 70% x x 18 7 3 6 1 1 x : 2 = : 0.5 : x = 0.4 : 70 4 8 4 9 = 9 : x = 2.25 : 8 4.4 x 7 3 : 7 = x : 0.6 : x = 30 : 1.8 8 2 9 6 1 = = 3 x x 7 1 5 1.2 9 = : 7 = 2 4 2.4 x 1 1 1 : x 0.4 : x = 0.2 : 9 3 6 9 8331= 880330= 1320= 6030= 211.4= 229= 0.20.1= 1425%= 13 5 3 1
3、6 6 3 = 8 = = 6 6 7 4 5 5 4 6.82.96= 6.390.94= 516= 16二、根据32752400,直接写出下面各题的得数。32000.75 3200.75 0.320.75 3.27500 2400.75 2400000.75 24007500 2400.75 597298 503396 67197 25348 2631.14.2 4.930.044.930.04 9 9 5 1 1 8.5 80 ( ) 4 5 4 4 5 9 4 1 1 ( ) 36202 8 3 2 6 3937994 57.88 4 7 1 3 4 7 5 6 2 4 1 6 1 1
4、 5 12 47 47 2 7 3 3 17 17 18 3 1 9 3 64 11 4 4 8 4 21612922 37.535141 17 0.7 2 40x 28 x 5 5 95% x x 18 9 3 6 7 = : 30 : x = 10 : 0.3 3 6 18 2 = 0.6 : x = 0.15 : 4 3.6 x 60 : 0.3 = x : 50 : x = 0.6 : 180 4 9 3 4 5 x x 5 7 1 0.4 5 8 2 2.2 x x 7 : x = 3.5 : 7 3 8 5 9848= 90030= 1620= 65050= 371.7= 114= 1.60.8= 5280%=