??????????????????????????????????????
??????????????????????????????????????????20×420=
????290×300=
????8100÷300=
????7600÷200=
????7600÷400=
????680??270=
????980÷14=
????4200÷30=
????6×1300=
????1300×50=
????200×48=
????930??660=
????530??280=
????9200÷400=
????840÷21=
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