45乘125乘9怎么简便计算?
问题描述:
45乘125乘9怎么简便计算?
答
45x125x9
=45x125x(8+1)
=45x125x8+45x125
=45000+5x9x125
=45000+5x125x(8+1)
=45000+5000+625
=50625