如题所述
72×56+72×45-72
=72×56+72×45-72×1
=72×(56+45-1)
=72×(55+45)
=72×100
=7200.
=72×56+72×45-72×1
=72×(56+45-1)
=72×(55+45)
=72×100
=7200.
温馨提示:答案为网友推荐,仅供参考
第1个回答 2010-05-17
原题=72*(56+45-1)
=72*100
=7200本回答被网友采纳
=72*100
=7200本回答被网友采纳