你能用简便方法计算下面的题吗? 999×999+1999; 87×64+108×29.

问题描述:

你能用简便方法计算下面的题吗?
999×999+1999;          
87×64+108×29.

(1)999×999+1999
=(1000-1)×999+1999
=999000-999+1999
=999000+(1999-999)
=999000+1000
=1000000;
(2)87×64+108×29
=87×64+3×36×29
=87×64+87×36
=87×(64+36)
=87×100
=8700.