45乘44分之43,43乘44分之43的简便方法
问题描述:
45乘44分之43,43乘44分之43的简便方法
答
45×43/44
=(44+1)×43/44
=44×43/44+1×43/44
=43+43/44
=43又43/44
43×43/44
=(44-1)×43/44
=44×43/44-1×43/44
=43-43/44
=42+1-43/44
=42+1/44
=42又1/44