二年级上册口算竞赛题(50道15分钟)班别:姓名:得分:41-2=16+80=72-9=26+3=20+39=6+25=54-9=47-6=59-13=65+8=73+17=82-7 =38-19=95-8=15-8=5+46=82-50=56-49=70-4=70-39=12+9=18+5=7+36=5+86=69+21=70-25=18+23=42-24=54-13=90-69=7+59=72-6=90-58=85-41=28+34=36+19= 45-7 = 65+47=43+9=64+18=39-21+50=74-34+18=99-14+9=3+84-18=13+72-15=62+15-8=45-34+40=59+40-28=20+67-29=65-16+50=