99x49+11x49-490简便运算

Question

如题所述

Answer 1

99x49+11x49-490简便运算
=49×(99+11-10)
=49×100
=4900;

您好，答题不易

如有帮助请采纳，谢谢

Answer 2

99x49+11x49-490
=99x49+11x49-49x10
=49x(99+11-10)
=49x100
=4900本回答被提问者采纳