9999X7778X3333X6666,简便运算,怎么算?要用递等式!

问题描述:

9999X7778X3333X6666,简便运算,怎么算?要用递等式!
谢谢了!我很急!

题目应是9999X7778+3333X6666
=9999X7778+1111X3X1111X6
=9999X7778+9999X2222
=9999X(7778+2222)
=9999X10000
=99990000