一、口算。(每题1分,共24分)
$1.4 - 0.6 = $ $5.1 ÷ 1.7 = $ $7.86 × 99 + 7.86 = $
$0.7 × 0.03 = $ $4.8 ÷ 0.24 = $ $2 × 0.8 ÷ 2 × 0.8 = $
$2.03 + 3.7 = $ $2.7 × 0.6 = $ $(0.2 - 0.2) × 4.8 = $
$3.6 ÷ 6 = $ $5 - 1.4 = $ $0.3 × (200 + 3) = $
$0.36 + 0.84 = $ $10 ÷ 0.25 = $ $6.5 + 7.8 + 3.05 = $
$0.18 ÷ 3.6 = $ $1.25 × 8 = $ $0.8 + 3.2 ÷ 0.08 = $
$10 - 0.01 = $ $5x - 4x = $ $9.63 × 101 - 9.63 = $
$4 ÷ 0.8 = $ $0.45 × 1000 = $ $3.7 × 4 ÷ 3.7 × 4 = $

0.8 3 786
0.021 20 0.64
5.73 1.62 0
0.6 3.6 60.9
1.2 40 17.35
0.05 10 40.8
9.99 x 963
5 450 16

二、用竖式计算,带$*$的要验算。(前2题每题3分,其余每题4分,共22分)
$9.3 - 2.67$ $36.8 + 4.98$ $*40.5 ÷ 18$
$0.48 × 5.04$(得数保留两位小数) $0.988 ÷ 0.14$(得数保留一位小数) $*2.9 × 0.036$

6.63 41.78 2.25
2.42 7.1 0.1044

三、计算下面各题,怎样简便就怎样计算。(每题4分,共32分)
$820 - 5.89 × 99 - 5.89$ $2.76 ÷ 0.4 ÷ (2.99 - 2.74)$
$888 × 0.33 + 0.34 × 444$ $30.5 - 1.8 × 0.42 ÷ 5.4$
$15.6 × 13.1 - 15.6 - 15.6 × 2.1$ $4.2 ÷ [3.6 - (13.78 - 10.88)]$
$47.5 - (0.74 + 8.64 ÷ 3.2)$ $28.25 - (17.25 + 6.42) - 4.58$

231 27.6
444 30.36
156 6
44.06 0