一、直接写得数
42+35 = 66+22= 87-50 = 47-14 = 38+20-30 =
35+17 = 79-7 = 14+27 = 28+52 = 40+20+40=
56-8 = 25+8 = 24+16= 98-88= 17+33+7 =
90-30= 85-80= 69-31= 38+12= 49-15-6 =
100-50= 46+54= 50+28= 5+25= ( )+6=31
29-19= 0+33= 25-6= 40+20= 33-( )=30
二、竖式计算
25+18= 69-45= 86+11= 33-16=
97-6-37= 34+8+42= 36-27+41= 63+27-51=