405-99用简便计算怎么做
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405-99用简便计算怎么做
405-99用简便计算怎么做
405-99用简便计算怎么做
405-(100-1)
=405-100+1
=305+1
=306
他回答对了..
405-99
=405-(100-1)
=405-100+1
=305-1
=304
=405-(100-1)
=(405-100)+1
=305+1
=306
405-99用简便计算怎么做
405-99用简便计算怎么做
405-99用简便计算怎么做
405-(100-1)
=405-100+1
=305+1
=306
他回答对了..
405-99
=405-(100-1)
=405-100+1
=305-1
=304
=405-(100-1)
=(405-100)+1
=305+1
=306