9999×7778+3333×6666.
问题描述:
9999×7778+3333×6666.
答
9999×7778+3333×6666,
=9999×7778+3333×3×2222,
═9999×7778+9999×2222,
=9999×(7778+2222),
=9999×10000,
=99990000;