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30+10=4020+30=5030+40=7020+50=7030+30=6020+60=8050+40=9040+50=9090-50=4090-40=503+2=530+20=504+5=940+50=909-7=290-70=206-5=160-50=10口算:3 + 2 = 4 + 5 = 6 4 = 30 + 20 = 40 + 50 = 60 40 = + = 看图填空:40343 + = 看图填空:40307020+40=50+30=60-30=30+20=6053352480503020+30 5020+406060+30 9020+50 7040+307060-3030204080709070-3040+3020+6020+7060-40口算口算503030104050203030506040503030106040403060501004080-40-108+7-98+60-3020+30+960+20+890-30+2050+30+770-40+527-7+6090-50-30算一算算一算