如题所述
第1个回答 2020-01-06
49ⅹ99ⅹ99
=[49ⅹ(100-1)]ⅹ99
=[49ⅹ100-49]ⅹ99
=4851ⅹ(100-1)
=4851ⅹ100-4851
=485100-4851
=480249本回答被网友采纳
=[49ⅹ(100-1)]ⅹ99
=[49ⅹ100-49]ⅹ99
=4851ⅹ(100-1)
=4851ⅹ100-4851
=485100-4851
=480249本回答被网友采纳
第2个回答 2020-01-06
49x99x99
=99x(50+1)
=50x99
=4950
=99x(50+1)
=50x99
=4950