75*25+75*75怎么简便运算(递等式).
问题描述:
75*25+75*75怎么简便运算(递等式).
急—
答
75×25+75×75
=75×25+75×25×3
=75×25×(1+3)
=75×(25×4)
=75×100
=7500
或=75×(25+75)
=75×100
=7500