99乘以49
=(100-1)×49
=100×49-49
=4900-49
=4851
㈡ 99x49的简便
99×49
=(100-1)×49
=100×49-1×49
=4900-49
=4851
㈢ 49x99简算
49×99=49×(100-1)=49×100-49=4900-49=1851
㈣ 49×99用简便方法计算
原式=49*100-49=4900-49=4851
㈤ 49ⅹ99ⅹ99最简便的方法
49ⅹ99ⅹ99
=[49ⅹ(100-1)]ⅹ99
=[49ⅹ100-49]ⅹ99
=4851ⅹ(100-1)
=4851ⅹ100-4851
=485100-4851
=480249
㈥ 99x49x99,的简便运算,怎么算
这个题目可以运用分配率进行简便计算,原式=(100-1)*7*7*(100-1)=(700-7)*(700-7)=480249