在横线里填上正确的数．
64=8× =16× = ×2
81=3× =9× =27×
56= × = × = ×
49×8=320+ =
57×6=300+ = ．
在横线里填上正确的数．
64=8× =16× = ×2
81=3× =9× =27×
56= × = × = ×
49×8=320+ =
57×6=300+ = ．
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