小数的简便计算:9.999×7778+3333×6.666

问题描述:

小数的简便计算:9.999×7778+3333×6.666

9.999×7778+3333×6.666
=9.999×7778+3333×0.003×2222
=9.999×7778+9.999×2222
=9.999×(7778+2222)
=9.999×10000
=99990