99×49×99的简便运算方法怎么做?
第1个回答 2022-05-15
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
第2个回答 2022-05-15
99×49×99
=(l00一1)×49×99
=4900×99一49×99
=(4900一50十1)×99
=4851×(l00一l)
=485l00一4851
=485100一5000+149
=480l00+149
=480249
=(l00一1)×49×99
=4900×99一49×99
=(4900一50十1)×99
=4851×(l00一l)
=485l00一4851
=485100一5000+149
=480l00+149
=480249
第3个回答 2022-05-15
99x49x99
=(100-1)x49x99
=100x49x99-49x99
=100x49x(100-1)-49x(100-1)
=100x49x100-100x49-49x100+49
=490000-4900-4900+49
=490000-10000+200+49
=480000+249
=480249
=(100-1)x49x99
=100x49x99-49x99
=100x49x(100-1)-49x(100-1)
=100x49x100-100x49-49x100+49
=490000-4900-4900+49
=490000-10000+200+49
=480000+249
=480249