1 直接写出得数。(每题1分,共20分)
$9 + 1.5 = $ $67×0.8 = $ $476 - 162 = $ $6.13×0 = $
$9.5 - 8.3 = $ $236.8 - 57.6 = $ $89×0.01 = $ $4.3 - 2.6 = $
$72 + 21.8 = $ $0.8×0.125 = $ $0.6 - 0.15 = $ $6.5 - 4.9 = $
$9.96 - 3.28 = $ $72.3 - 35.5 = $ $0.26÷0.13 = $ $3.98 - 1.27 = $
$17 - 8.2 = $ $0.01÷0.1 = $ $0.32×5 = $ $75 + 9.8 = $

10.5 53.6 314 0
1.2 179.2 0.89 1.7
93.8 0.1 0.45 1.6
6.68 36.8 2 2.71
8.8 0.1 1.6 84.8

2 列竖式计算,带※的得数保留两位小数。(每题3分,共9分)
$6.3×0.28 = $ $1.62÷1.5 = $ ※$69.34÷18.37≈$

竖式略
1.764 1.08 3.77

3 计算下列各题,能简算的要简算。(每题3分,共9分)
$0.7×5.2 + 8.3×5.2 + 5.2$ $16×3.5×1.25$ $7.62×0.8 + 0.2×7.62$

52 70 7.62

4 解方程。(每题4分,共12分)
$3.2x - 4.8 = 2.4$ $18 + 7x = 39$ $15x + 3.8×12 = 87.6$

解:$x=2.25$ 解:$x=3$ 解:$x=2.8$