20以内三连减口算练习题(已排版)时间:错误率:15-14-1=17-12-5=19-5-12=17-1-7=16-10-1=14-4-1=14-1-4=20-9-5=4-2-1=15...
整十数加减整十数练习题用时:错误:70+30=90-40=40+40=70-20=50+40=90-60=10+40=70-10=50+50=60-50=20+30=80-50=100-10=100...
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