用简便的方法算:19999乘以12345+19999-2345乘以19999
题目
用简便的方法算:19999乘以12345+19999-2345乘以19999
答案
19999×12345+19999-2345×19999
=19999×(12345+1-2345)
=19999×10001
=200009999
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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