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48×25
=(40+8)×25
=40×25+8×25
=1200
(125×83+125×17)×8
282×6+18×6=
21×98
=21×(100-2)
=21×100+21×2
=2100+42
=2142
(9+8)×5=9×5+8×5
12×(4+1)=12×4+12
72×101=( )
79×99+79=( )
进入组卷