数学二年级上册数学连加连减口算题卡天天练
44+8-37 =54+17-39=69+29-78=63-11+16=54-45+38=92-68+26=14-10+55=14+21-23=29+48-48=35-25+57=48+27-2=50
数学二年级上册数学连加连减口算题卡天天练