Question

9999×7778+3333×6666等于多少？请用简便方法计算

Answer 1

9999×7778+3333x6666 =9999X7778十9999×2222 =9999×（7778十2222） =9999×10000 =99990000

Answer 2

9999×7778+3333×6666=9*1111*（7*1111+1）+3*1111*6*1111
=63*1111²+18*1111²+9*1111
=81*1111²+9*1111
=9*1111*（9*1111+1）
=99990000