如题所述
第1个回答 2015-04-12
答:45*99
=45*(100-1)
=4500-45
=4455
=45*(100-1)
=4500-45
=4455
第2个回答 2015-04-12
45 x99
=45x(100-1)
=45x100-45x1
=4500-45
=4455本回答被网友采纳
=45x(100-1)
=45x100-45x1
=4500-45
=4455本回答被网友采纳
第3个回答 2015-04-12
45x99
=45x(100-1)
=45x100-45x1
=4500-45
=4455
=45x(100-1)
=45x100-45x1
=4500-45
=4455