1 直接写出得数。(每题1分,共20分)
$91 + 68.5 = $ $0.72÷0.18 = $ $1.5 + 0.25 = $ $34×0.5 = $
$297 - 158 = $ $18×0.01 = $ $15 - 7.8 = $ $15 - 6.3 = $
$4.5 - 3.8 = $ $2.5 - 2.5÷5 = $ $234 - 77 = $ $0.9÷0.3 = $
$9.08×0 + 9 = $ $8.8×0.3 = $ $5.6×3 = $ $3.2 - 0.1 = $
$6.3 + 0.37 = $ $3.2 + 5 = $ $3.6÷0.4 = $ $0.333×0.2 = $

159.5 4 1.75 17
139 0.18 7.2 8.7
0.7 2 157 3
9 2.64 16.8 3.1
6.67 8.2 9 0.0666

2 列竖式计算,带※的得数保留两位小数。(每题3分,共9分)
$19.48×25.61 = $ $7.82÷3.4 = $ ※$53.5÷0.85≈$

竖式略
498.8828 2.3 62.94

3 计算下列各题,能简算的要简算。(每题3分,共9分)
$99×2.6$ $9.24 - 6.3 + 0.76 - 2.7$ $52.6×0.83 + 0.17×52.6$

257.4 1 52.6

4 解方程。(每题4分,共12分)
$5x - 2.5 = 5$ $6×7 + 3x = 69$ $54 - 18 + 3x = 72$

解:$x=1.5$ 解:$x=9$ 解:$x=12$