72×56+72×45-72怎么简便运算?
问题描述:
72×56+72×45-72怎么简便运算?
答
原题=72*(56+45-1)
=72*100
=7200
72×56+72×45-72怎么简便运算?
原题=72*(56+45-1)
=72*100
=7200