仔细观察,哪幅图是大长方形中缺少的那一块?
(7.5+7.5+7.5+7.5)×125×4.
1999+999×999.
8888008×125.
3.75×4.23×36﹣125×0.423×2.8.
25×2.64+12.5×0.726+0.125.