手脑速算教程及练习(4)

二、一位数的任意加减混合练习

2+1+4-3+4=                             1+3+2+2-4=          

3+2+1-4+3=                             2+2+4-1-3=         

2+3+4-5+4=                             4+2-3+4-2=

4+3+1-4+2=                             4+3+1-4+3=           

8-2-4+3+1=                             9-3-2+4-5=         

7-3+2+3-8=                             3+3-2+4-5=

6+2-4+3-6=                             5+3-4+2-3=           

2+6-8+3+2=                             4+4-3-2+3=         

1+2+3-4+3=                             8-3-2+4-6=

9-3-3+4+2=                             7-4+2-3+5=           

6-2+3-5+4= 

三、两位数与一位数的混合练习
12+12+21+32+2=                        22+33+2-4+23=

14+44+30-4+15=                         43+53-4+7-55=