七年级下册北师大版数学课后习题2.4知识技能1、2题解答、要有详细过程 求七年级下册北师大版数学书的第88~89页习题3.1知识技能...
\u5317\u5e08\u5927\u7248\u4e03\u5e74\u7ea7\u4e0b\u518c\u6570\u5b66\u7b2c\u4e00\u7ae0\u8bfe\u540e\u4e60\u9898\u7b54\u6848\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u6ca1\u6709\uff0c\u8fd8\u662f\u81ea\u5df1\u5199\u6216\u8005\u95ee\u5bb6\u957f\u6216\u8001\u5e08\u3002\u4ed6\u4eec\u4f1a\u7ed9\u4f60\u8bb2\u7684\uff0c\u4e0a\u8bfe\u8981\u8ba4\u771f\u542c\u554a\uff01
1\u3001
\uff081\uff090.01\u00d70.01\u00d70.01=0.000001=10\uff0d6\u7c733\uff1b
\uff082\uff091\u00f710\uff0d6=1000000=100\u4e07\u4e2a\uff0e
2\uff0e\uff081\uff09\u56e0\u4e3a1\u5fae\u7c73=10\uff0d6\u7c73\uff0c\u6240\u4ee50.0003\u00d710\uff0d6=3\u00d710\uff0d10\uff1b
\uff082\uff09350\u00f75\u00d7108=7\u00d710\uff0d7\u6beb\u7c732\uff1b
\uff083\uff091\u00d710\uff0d9\u00d760000=6\u00d710\uff0d5\u7c73\u56e0\u767e\u5ea6\u4e0d\u8bc6\u522b\u79d1\u5b66\u8ba1\u6570\u6cd5\u4e0a\u6807\uff0c\u4e0b\u9644\u56fe\u7247\u683c\u5f0f\uff0c\u8bf7\u53c2\u8003\u4f7f\u7528\u3002
第一题：
∵AB∥CD
∴∠α＝∠D=45°
∠C+∠B＝180°
又∵∠D＝∠C
∴∠D+∠C=180°
∴∠C=45° ∠B=135°
学期都结束了
绛旓細娆㈣繋鏉ュ埌鎴戜滑鐨勫瘨鍋囬涔犵壒杈戯紒浠婂ぉ锛屾垜浠皢娣卞叆瑙ｈ鍖楀笀澶х増鍒濅竴涓冨勾绾т笅鍐屾暟瀛鏁欐潗鐨勬牳蹇冪煡璇嗙偣锛屽姪浣犳彁鍓嶄负鏂板鏈熷仛濂藉噯澶囥傚埆鎷呭績鍐呭绻佸锛屽彧闇涓閿敹钘忥紝楂樻晥瀛︿範浠庣幇鍦ㄥ紑濮嬨傜煡璇嗙偣姒傝锛</绗竴绔狅細鏈夌悊鏁</ - 瀛︿範姝ｈ礋鏁般佸垎鏁般佸皬鏁扮殑杩愮畻瑙勫垯锛岀悊瑙ｆ暟杞寸殑姒傚康銆傜浜岀珷锛氫唬鏁板垵姝</ - 鎺屾彙涓...
绛旓細1锛 5/3m2 n2-2m 2锛-2b+5/3c2 3锛16x3+4x+1 4锛3a-2+2b 5)a-/2b3-3/4ab3 6) 3/5mn-3/2m2+1/4n2 7) 1/2xy+5/4y-5/2 8) 銆(x+1)(x+2)-2銆懨穢 = 銆恱2+3x+2-2銆懨穢 = 銆恱2+3x銆懨穢 = x+3 瑙ｅ喅闂 锛堚垙a2H+1/4鈭廰2h锛壝(1/16鈭廰2脳8...
绛旓細鍖楀笀澶х増涓冨勾绾т笅鍐屾暟瀛鐭ヨ瘑缁撴瀯鍥 涓銆佹暣寮忕殑杩愮畻 1銆佹暣寮 2銆佹暣寮忕殑鍔犳硶 3銆佸悓搴曟暟骞傜殑涔樻硶 4銆佸箓鐨勪箻鏂逛笌绉殑涔樻柟 5銆佹暣寮忕殑涔樻硶 6銆佸钩鏂瑰樊鍏紡 7銆佸畬鍏ㄥ钩鏂瑰叕寮 8銆佹暣寮忕殑闄ゆ硶 浜屻佸钩琛岀嚎涓庣浉浜ょ嚎 1銆佷綑瑙掍笌琛ヨ 2銆佹帰绱㈠钩琛岀殑鏉′欢 3銆佸钩琛岀嚎鐨勭壒寰 4銆佺敤灏鸿浣滅嚎娈靛拰瑙 涓夈佺敓娲讳腑鐨...
绛旓細鐭ヨ瘑鎶鑳 1 锛氬洜涓篈B鈥朇D锛屽悓浣嶈鐩哥瓑锛屸垹D=鈭犖憋紝鑰屸垹D=鈭燙锛屼粠鑰屸垹D=鈭燙=45掳銆傗垹B+鈭燙=180掳锛屼袱鐩寸嚎骞宠锛屽悓鏃佸唴瑙掍簰琛ワ紒鍒欌垹B=135掳锛2锛氣垹A=鈭燛=120掳 鍥犱负AB鈥朇D锛屽垯鈭1+鈭燗=180掳锛屼笖鈭1=60掳锛屸垹E鍚岀悊鍙互寰楀埌锛鏁板鐞嗚В锛氬崡鍋忎笢48掳 锛堝唴閿欒锛 鎴栬 涓滃亸鍗42掳...
绛旓細涓.閫夋嫨棰橈細锛堟瘡灏忛3鍒嗭紝鍏24鍒嗭級1.鍦紝锛-锛岋紝3.14锛2+锛- 锛0锛岋紝1.262662666鈥︿腑锛屽睘浜庢棤鐞嗘暟鐨勪釜鏁版槸锛 锛堿.3涓 B. 4涓 C. 5涓 D.6涓 2.鑻<0,鍦ㄥ钩闈㈢洿瑙掑潗鏍囩郴涓紝灏嗙偣(a,锛3)鍒嗗埆鍚戝乏銆佸悜涓婂钩绉4涓崟浣嶏紝鍙互寰楀埌鐨勫搴旂偣鐨勪綅缃湪( )A.绗竴璞￠檺 B.绗簩璞￠檺 C....
绛旓細杩欑瘒鍏充簬鍖楀笀澶х増涓冨勾绾т笅鍐屾暟瀛鏈熸湯璇曞嵎鍙婄瓟妗堝ぇ鍏,鏄 鐗瑰湴涓哄ぇ瀹舵暣鐞嗙殑,甯屾湜瀵瑰ぇ瀹舵湁鎵甯姪! 涓銆佺粏蹇冨～涓濉(鏈ぇ棰樺叡12灏忛,姣忓皬棰3鍒,鍏36鍒,鐩存帴鎶婄瓟妗堝～鍦ㄩ涓殑妯嚎涓) 1.濡傚浘,鍦ㄧ洿绾縜銆乥銆乧涓,a鈭,鑻モ垹1=700,鍒欌垹2=___. 2.濡傚浘,鐩寸嚎AB涓嶤D鐩镐氦浜庣偣O,OE鈯D,鈭燘OD=1200,鍒欌垹AOE=...
绛旓細(2)鎵撅細鎵惧嚭鑳藉琛ㄧず棰樻剰涓や釜鐩哥瓑鍏崇郴;(3)鍒楋細鏍规嵁杩欎袱涓浉绛夊叧绯诲垪鍑哄繀闇鐨勪唬鏁板紡锛屼粠鑰屽垪鍑烘柟绋嬬粍;(4)瑙ｏ細瑙ｈ繖涓柟绋嬬粍锛屾眰鍑轰袱涓湭鐭ユ暟鐨勫;(5)绛旓細鍦ㄥ姹傚嚭鐨勬柟绋嬬殑瑙ｅ仛鍑烘槸鍚﹀悎鐞嗗垽鏂殑鍩虹涓婏紝鍐欏嚭绛旀.鍖楀笀澶т竷骞寸骇鏁板涓嬪唽鐩綍鐩稿叧 鏂囩珷 锛1. 鍖楀笀澶х増涓冨勾绾ф暟瀛︿笅鍐鐭ヨ瘑鐐 2. 涓...
绛旓細鍖楀笀澶х増涓冨勾绾т笅鍐屾暟瀛绗竴绔犳暣鏁扮殑缁忓吀棰樼洰,楂樺垎楂樺垎!!! 30 涓瀹氳鏄暣鏁,璁＄畻棰樸佸～绌洪兘鍙互,浣嗕竴瀹氳缁忓吀,涓嶉渶瑕侀毦,浣嗚缁忓父鐘敊閭ｇ棰樼洰,鑷冲皯20棰,澶嶅埗涔熻,浣嗕笉瑕侀殢渚垮鍒,瑕佸ソ鐨勯... 涓瀹氳鏄暣鏁,璁＄畻棰樸佸～绌洪兘鍙互,浣嗕竴瀹氳缁忓吀,涓嶉渶瑕侀毦,浣嗚缁忓父鐘敊閭ｇ棰樼洰,鑷冲皯20棰,澶嶅埗涔熻,浣嗕笉瑕...
绛旓細瑙ｏ細鍦ˋB涓婃埅鍙朌锛岃繛鎺D锛屼娇CD锛滳A 鍥犱负CA锛滳D 鎵浠ヨA锛濊CDA 鍥犱负瑙扖DA鏄CDB鐨勫瑙 鎵浠ヨCDA=瑙扗CB+瑙扖BD 鍥犱负瑙払锛漍 鎵浠ヨDCB=X 鎵浠モ柍CAD鍜屸柍CDB閮芥槸绛夎叞涓夎褰 绛旓細鈥斺斺旇繍鐢ㄤ笁瑙掑舰澶栬瀹氱悊
绛旓細锛1锛2鍒嗕箣x+6 锛2锛2x+x-6
