1 直接写出得数。(每题1分,共20分)
$10 - 6.9 - 3.1 = $ $3.4 + 3.9 + 2.6 = $ $24 - 2.4 - 6.6 = $ $6.3 + 2.7 - 5.8 = $
$6.3 + 3.7 - 6.3 = $ $5.8 + 6.3 - 3.4 = $ $8 - 5.3 + 2.8 = $ $8.5 + 4.3 - 1.7 = $
$9.2 - 7.5 + 5.8 = $ $5 - 2.5 - 1.4 = $ $1.6 - 2.4 + 3.4 = $ $3.6 + 2.7 + 6.4 = $
$1.3 + 6.7 + 4.3 = $ $3.6 + 7.5 - 2.6 = $ $6.4 - 2.7 + 1.8 = $ $3.5 + 4.2 + 2.5 = $
$5.8 + 0.3 - 2.7 = $ $4.7 + 3.6 - 2.1 = $ $7.9 - 4.3 + 2.7 = $ $11 - 3.4 + 7.7 = $

1.0 9.9 15 3.2
3.7 8.7 5.5 11.1
7.5 1.1 2.6 12.7
12.3 8.5 5.5 10.2
3.4 6.2 6.3 15.3

2 列竖式计算。(每题3分,共12分)
$200 - 98.74 = $ $78.7 - 38.37 = $ $3.61 + 8.2 = $ $40.75 + 3.47 = $

2.竖式略
101.26 40.33 11.81 44.22

3 计算下面各题,能简算的要简算。(每题3分,共18分)
$3.69 + 9.85 + 6.31$ $60.7 - (10.65 - 2.72)$ $8 - 3.27 + 2.27$
$13.7 - (3.7 - 0.38)$ $12.57 - 7.49 - 2.51$ $3.75 + 2.43 + 1.25 + 0.57$

3.19.85 52.77 7
10.38 2.57 8