1:1  01-25[数学]范老师教你证明“A字型、8字形”图中角关系
推荐理由：让人眼花缭乱的图形中，通常会发现“A字型”和“8字型”的身影，熟记简单图形的性质对我们解决复杂问题有很大帮助。同学们要在知道其来龙去脉的基础上，灵活运用哦！ 讲解人：http://www.jiandan100.cn/teacher/f6bde55ee0bc42adac11fef663fb1257/ ，北京五中数学教师，常年辅导竞赛班 题面： 两个基本图形 (1)如图，求证:∠BCD=∠A+∠B+∠D 
(2)如图，求证:∠A+∠B =∠C+∠D
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看似简单的结论，往往是解决问题的关键，同学们不要轻视哦！ ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 查看更多本年级每周一题，请点击：http://www.jiandan100.cn/bbs/upload/forumdisplay.php?fid=376& 浏览本期“简单学习电子周报”完整目录：http://www.jiandan100.cn/bbs/upload/viewthread.php?tid=658656 |
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