简便计算:41×49-49
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简便计算:41×49-49
简便计算:41×49-49
简便计算:41×49-49
41×49-49
=49×(41-1)
=49×40
=1960
=(41-1)*49
=40*49
=1960
41×49-49
=(41-1)*49=40*49=40*(49+1)-40=40*50-40=1960
41×49-49
=49×(41-1)
=49×40
=1960
41x49-49
=49(41-1)
=49x40
=1960
=40*49=1960