1 直接写出得数。(每题1分,共20分)
$83 - 47 = $ $783 - 267 = $ $261 ÷ 9 = $ $3.8 + 5.6 = $
$46 + 23 = $ $425 + 678 = $ $6.3 - 3.1 = $ $8.6 - 2.6 = $
$6.3 + 1.59 = $ $12.1 × 0.4 = $ $4.52 + 0.08 = $ $270 ÷ 5 = $
$7.6 - 3.8 = $ $3.9 + 6.1 = $ $2.9 + 6.8 = $ $5.6 - 1.9 = $
$3.5 + 0.28 = $ $3.63 + 0.07 = $ $5.5 ÷ 10 = $ $2.339 × 100 = $

36 516 29 9.4
69 1103 3.2 6
7.89 4.84 4.6 54
3.8 10 9.7 3.7
3.78 3.7 0.55 233.9

2 列竖式计算。(每题3分,共12分)
$4.88 + 3.2 = $ $62.6 - 8.86 = $ $16.49 + 0.76 = $ $24.75 - 5.49 = $

竖式略
8.08 53.74 17.25 19.26

3 计算下面各题,能简算的要简算。(每题3分,共18分)
$41.7 - 19.4 + 25.8$ $14.5 - 2.17 - 8.83$ $65.1 - 44.21 + 34.9 - 55.79$
$7.41 + 2.36 + 1.59$ $50 - 12.14 - 7.86$ $9400 ÷ 25 ÷ 4$

48.1 3.5 0
11.36 30 94