Question

333✘666+778✘999简便方法？

Answer 1

333✘666+778✘999
= 333x(666+778x3) 后者提取666也行 666x(333+388x3)
= 333x3000
= 999000

Answer 2

333X666+778×999
=333×3X222+778×999
=999×222+778×999
=999×（222+778）
=999X1000
=999000