20以内减法口算练习题4000题时间:错误率:10-5=15-1=15-3=20-19=11-1=17-13=9-2=14-10=19-5=18-2=7-7=19-18=20-9=18-17=12...
20以内的加法口算练习题4000题时间:错误率:9+6=15+5=8+10=3+1=3+5=13+7=1+10=2+17=16+1=15+4=6+10=3+16=6+5=1+3=1+6=4+8...
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