手脑速算教程及练习(9)

37+42-53+16+28=                   54+27-18-9+20=

33+42-59+58-29=                   32+63-88+14+20=

12+64-17+29-33=                   43+40-15-54+23=

37+17+29-13-38=                   30+38-43-19+13=

16+59-55+18+43=                   36+56-29-35+37=

44+27+8-35+15=                    39+32+27-45-50=

34+39+18-25-61=                   74+16-29-50+40=

34+27-56+23+12=                   39+19+23-28-27=

78+13-27-16-39=                    16+19+37-47+24=

85+4-79+23+57=                    25+37-44+27+29=

34+19-26+29-17=                    49+18-26-28+40=

26+28-19-18+32=                    67+29-50-18+43=

16+59-55-18+17=                    36+56-29-35+9=

22+34+18-57+23=                    45-17+25+8-13=

56+43-79+47+12=                    67+32-89+53+21=

36+58-78+16+11=                  43+26+12-57-14=

78-37+17-49+10=                   28+32+15-33-9=

10-7+88-57+30=                    21-9+43+28-67=

56+29-17-19+8=                    29+28+27-68-1=

32+33+31-67-19=                   53+39-87+18+26=

练习十二、十三
一、复习伸拇屈凑加法口诀和屈拇伸凑减法口诀