628-199这道题怎样简算
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628-199这道题怎样简算
628-199这道题怎样简算
628-199这道题怎样简算
628-199
=628-(200-1)
=628-200+1
=429
慢慢算、!
628-199
=628-200+1
=428+1
=429
628-199
=627+1-200+1
=427+2
=429