??????????????????????????????????????
??????????????????????????????????????????48??27=
????4500×20=
????73??15 =
????120×600 =
????200×360=
????6800×400=
????280??270=
????4×2500=
????6000÷40=
????5×1280=
????310??70=
????400×14=
????470??180=
????1000÷25=
????160×600=
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