久久99久久精品久久久久久_初一下冊數學(xué)《同位角、內錯角、同旁?xún)冉恰方贪?/title> <meta name="keywords" content="初一下冊數學(xué)《同位角、內錯角、同旁?xún)冉恰方贪?> <meta name="description" content="課型：新授課備課人：徐新齊審核人：霍紅超學(xué)習目標 1. 理解三線(xiàn)八角中沒(méi)有公共頂點(diǎn)的角的位置關(guān)系，知道什么是同位角、內錯角、同旁?xún)冉?毛 2. 通過(guò)比較、觀(guān)察、掌握同位角、內錯角、同旁?xún)冉堑奶卣�，能正確識別圖形中的同位角、內錯角和同旁?xún)冉? 重點(diǎn)"> <link rel="canonical" href="http://www.uydoc.com/"/> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script type="text/javascript"> if((navigator.userAgent.match(/(phone|pad|pod|mobile|ios|android|BlackBerry|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|symbian|transcoder)/i))){window.location = window.location.href.replace(/www./, 'm.');} var D=new Date(),RAND_STR=D.getUTCFullYear()+"_"+D.getUTCMonth()+"_"+D.getUTCDate()+"_"+(Math.floor(D.getUTCHours()/3)); document.write('<script type="text/javascript" src="http://www.uydoc.com/static/js/p.js?'+RAND_STR+'"><\/script>'); </script> 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<p>初一下冊數學(xué)《同位角、內錯角、同旁?xún)冉恰方贪?/p><p>　　<strong>課型：新授課備課人：徐新齊審核人：霍紅超</strong></p><p style="text-align: center;"><img loading="lazy" src="https://p.9136.com/00/l/cafdd1a705_5fbf7ee06bb1f.jpg" alt="初一下冊數學(xué)《同位角、內錯角、同旁?xún)冉恰方贪?/></p><p>　　學(xué)習目標</p><p>　　1. 理解三線(xiàn)八角中沒(méi)有公共頂點(diǎn)的角的位置關(guān)系，知道什么是同位角、內錯角、同旁?xún)冉?毛</p><p>　　2. 通過(guò)比較、觀(guān)察、掌握同位角、內錯角、同旁?xún)冉堑奶卣�，能正確識別圖形中的同位角、內錯角和同旁?xún)冉?</p><p>　　重點(diǎn)難點(diǎn)</p><p>　　同位角、內錯角、同旁?xún)冉堑奶卣?/p><p>　　教學(xué)過(guò)程</p><p>　　一·導入</p><p>　　1.指出右圖中所有的鄰補角和對頂角？</p><p>　　2. 圖中的∠1與∠5，∠3與∠5，∠3與∠6 是鄰補角或對頂角嗎?</p><p>　　若都不是，請自學(xué)課本P6內容后回答它們各是什么關(guān)系的角?</p><p>　　二·問(wèn)題導學(xué)</p><p>　　1.如圖⑴，將木條，與木條c釘在一起，若把它們看成三條直線(xiàn)則該圖可說(shuō)成"直線(xiàn) 和直線(xiàn) 與直線(xiàn) 相交" 也可以說(shuō)成"兩條直線(xiàn) ，被第三條直線(xiàn) 所截".構成了小于平角的角共有個(gè)，通常將這種圖形稱(chēng)作為"三線(xiàn)八角"。其中直線(xiàn) ，稱(chēng)為兩被截線(xiàn)，直線(xiàn) 稱(chēng)為截線(xiàn)。</p><p>　　2. 如圖⑶是"直線(xiàn) ，被直線(xiàn) 所截"形成的圖形</p><p>　�。�1）∠1與∠5這對角在兩被截線(xiàn)AB,CD的，在截線(xiàn)EF 的，形如" " 字型.具有這種關(guān)系的一對角叫同位角。</p><p>　�。�2）∠3與∠5這對角在兩被截線(xiàn)AB,CD的，在截線(xiàn)EF的，形如" " 字型.具有這種關(guān)系的一對角叫內錯角。</p><p>　�。�3）∠3與∠6這對角在兩被截線(xiàn)AB,CD的，在截線(xiàn)EF的，形如" " 字型.具有這種關(guān)系的一對角叫同旁?xún)冉恰?/p><p>　　3.找出圖⑶中所有的.同位角、內錯角、同旁?xún)冉?/p><p>　　4.討論與交流：</p><p>　�。�1）"同位角、內錯角、同旁?xún)冉?quot;與"鄰補角、對頂角"在識別方法上有什么區別？</p><p>　�。�2）歸納總結同位角、內錯角、同旁?xún)冉堑奶卣?</p><p>　　同位角："F" 字型，"同旁同側"</p><p>　　"三線(xiàn)八角" 內錯角："Z" 字型，"之間兩側"</p><p>　　同旁?xún)冉牵?quot;U" 字型，"之間同側"</p><p>　　三·典題訓練</p><p>　　例1. 如圖⑵中∠1與∠2，∠3與∠4, ∠1與∠4分別是哪兩條直線(xiàn)被哪一條直線(xiàn)所截形成的什么角？</p><p>　　小結將左右手的大拇指和食指各組成一個(gè)角，兩食指相對成一條直線(xiàn)，兩個(gè)大拇指反向的時(shí)候，組成內錯角；</p><p>　　兩食指相對成一條直線(xiàn)，兩個(gè)大拇指同向的時(shí)候，組成同旁?xún)冉牵?/p><p>　　自我檢測</p><p>　�、比鐖D⑷，下列說(shuō)法不正確的是（）</p><p>　　A、∠1與∠2是同位角 B、∠2與∠3是同位角</p><p>　　C、∠1與∠3是同位角 D、∠1與∠4不是同位角</p><p>　�、踩鐖D⑸，直線(xiàn)AB、CD被直線(xiàn)EF所截，∠A和是同位角，∠A和是內錯角,∠A和是同旁?xún)冉?</p><p>　�、橙鐖D⑹, 直線(xiàn)DE截AB, AC, 構成八個(gè)角:</p><p>　�、� 指出圖中所有的同位角、內錯角、同旁?xún)冉?</p><p>　�、凇螦與∠5, ∠A與∠6, ∠A與∠8, 分別是哪一條直線(xiàn)截哪兩條直線(xiàn)而成的什么角？</p><p>　�、慈鐖D⑺，在直角ABC中，∠C＝90°，DE⊥AC于E,交AB于D .</p><p>　�、僦赋霎擝C、DE被AB所截時(shí)，∠3的同位角、內錯角和同旁?xún)冉?</p><p>　�、谠囌f(shuō)明∠1＝∠2＝∠3的理由.（提示：三角形內角和是1800）</p><p>　　</p> <script>s("content_relate");</script><p>【初一下冊數學(xué)《同位角、內錯角、同旁?xún)冉恰方贪浮肯嚓P(guān)文章：</p><p><a target="_blank" href="http://www.uydoc.com/jiaoan/4902375.html" title="《同位角、內錯角、同旁?xún)冉恰返恼f(shuō)課稿【精選】">《同位角、內錯角、同旁?xún)冉恰返恼f(shuō)課稿【精選】</a><span>03-24</span></p><p><a target="_blank" title="《同位角、內錯角、同旁?xún)冉恰氛f(shuō)課稿">《同位角、內錯角、同旁?xún)冉恰氛f(shuō)課稿</a><span>11-19</span></p><p><a target="_blank" href="http://www.uydoc.com/shuokegao/2338282.html" title="《同位角、內錯角、同旁?xún)冉恰返恼f(shuō)課稿">《同位角、內錯角、同旁?xún)冉恰返恼f(shuō)課稿</a><span>02-13</span></p><p><a target="_blank" href="http://www.uydoc.com/jiaoxuefansi/2022380.html" title="同位角、內錯角、同旁?xún)冉墙虒W(xué)反思">同位角、內錯角、同旁?xún)冉墙虒W(xué)反思</a><span>11-24</span></p><p><a target="_blank" href="http://www.uydoc.com/jiaoxuefansi/2174941.html" 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