(9999×9999+19999)÷1000000简算与巧算

问题描述:

(9999×9999+19999)÷1000000简算与巧算

(9999×9999+19999)÷1000000
=(9999×9999+10000+9999)÷1000000
=[9999×(9999+1)+10000]÷1000000
=(9999×10000+10000)÷1000000
=10000×(9999+1)÷1000000
=10000×10000÷1000000
=100选我吧.