一、用竖式计算,带*的要验算。
$3.56 + 7.5$ $3 - 2.08$ *$15.3 - 6.04$
$100 - 21.35$ $12.45 + 5.9$ *$8.1 - 3.19$
$10.9 + 7.32$ $9.7 - 7.27$ *$9.98 + 4.02$

11.06 0.92 9.26 78.65 18.35 4.91 18.22 2.43 14

二、计算下面各题。
$13.72 - 2.9 - 3.4$ $1.56 + 9.82 + 1.07$ $10.9 - 8.68 + 2.4$
$4.907 + 12.78 - 7.63$ $12.83 - 2.25 - 2.74$ $1.725 + 6.175 - 3.15$
$6.93 + 1.37 - 5.86$ $8.4 - 0.86 + 3.99$ $74.28 - (4.36 + 5.42)$
$60.4 - 3.72 - 15.8$ $5.59 + 2.67 - 3.8$ $0.65 + 9.48 + 16.7$

7.42 12.45 4.62 10.057 7.84 4.75 2.44 11.53 64.5 40.88 4.46 26.83

13.72 - 2.9 - 3.4 = 10.82 - 3.4 = 7.42
1.56 + 9.82 + 1.07 = 11.38 + 1.07 = 12.45
10.9 - 8.68 + 2.4 = 2.22 + 2.4 = 4.62
4.907 + 12.78 - 7.63 = 17.687 - 7.63 = 10.057
12.83 - 2.25 - 2.74 = 10.58 - 2.74 = 7.84
1.725 + 6.175 - 3.15 = 7.9 - 3.15 = 4.75
6.93 + 1.37 - 5.86 = 8.3 - 5.86 = 2.44
8.4 - 0.86 + 3.99 = 7.54 + 3.99 = 11.53
74.28 - (4.36 + 5.42) = 74.28 - 9.78 = 64.5
60.4 - 3.72 - 15.8 = 56.68 - 15.8 = 40.88
5.59 + 2.67 - 3.8 = 8.26 - 3.8 = 4.46
0.65 + 9.48 + 16.7 = 10.13 + 16.7 = 26.83