69×27-27×18 49×69的简便运算方法?
2个回答
展开全部
69×27–27×18
=27×(69–18)
=27×51
=27×(50+1)
=27×50+27
=1350+27
=1377
49×69
=(50–1)×(70–1)
=3500–70–50–1
=3500–121
=3379
=27×(69–18)
=27×51
=27×(50+1)
=27×50+27
=1350+27
=1377
49×69
=(50–1)×(70–1)
=3500–70–50–1
=3500–121
=3379
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询