2.用竖式计算。（带★的要验算）
26.1 - 5.06 =
21.56 + 6.74 =
★9.5 + 4.85 =
37.82 + 5.74 =
27.07 - 9.86 =
★12.45 - 1.96 =

2.21.04 28.3 14.35 43.56 17.21 10.49

3.脱式计算。（能简算的要简算）
5.09 +13.58 +20.96
85.7 - (24.1 -8.5)
50 -9.8 +0.2
5.26 +3.1 +1.74
5.02 -2.7 +0.98
16.23 -5.4 -4.6

3.5.09 +13.58 +20.96
=18.67 +20.96
=39.63
85.7 - (24.1 -8.5)
=85.7 -15.6
=70.1
50 -9.8 +0.2
=40.2 +0.2
=40.4
5.26 +3.1 +1.74
=5.26 +1.74 +3.1
=7 +3.1
=10.1
5.02 -2.7 +0.98
=5.02 +0.98 -2.7
=3.3
16.23 -5.4 -4.6
=16.23 -(5.4 +4.6)
=16.23 -10
=6.23

有一个人花19元钱买了个玩具，20元钱卖了出去。他觉得不划算，又花21元钱买了回来，再22元钱卖出去。他赚了多少钱？

2元