(9999乘9999加19999)除以1000000简便计算
1个回答

(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