39+59-28-17-11=                    87+10-28-37+18=

98-77+32-50+33=                   59+11+23-90+69=

63+17-43-19-18=                    77+22-39-38+17=

59-23+44-17+21=                   85-11-17+34-37=

62-48+39+32-27=                   36+18-27+16+19=

14+28+32-19-16=                   55+37-68+5+24=

13+19+54-67+12=                  63+27-58+14+13=

38+16-44+58-29=                   92-68+57-32-13=

32+59-87+39-18=                   54-36-18+23+59=

82-65+14+18-20=                   33+66-87+13+50=

90-52+22-38+7=                    81-79+5+57+6=

73-54+9-8+62=                     60-28+7+9+32=

54-29+15+49-80=                   51-47+26+28-9=

32-19+58-16+28=                   63-38+27-19+8=

29+14+38-16-27=                   91-79+16+17+28

練習十一
一、復(fù)習2——18的組成

二、100以內(nèi)的練習
39+42-53+18-7=                    27+46-35+48-23=

49-24+56+15-34=                   54+32-62-6+38=

68-44+63+5-27=                    73+21-59-16+48=

99-88+17+19-23=                   82-34+41-7+29=

94-53+37-17-8=                     58+32-44+14+8=