大神求解五道七年级下册北师大版数学题！
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1
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第二题，有平行四边形ABCD，主要是证△ABD与△CDB全等，SAS。
然后你就应该知道了吧
第三题答案是 2x^3+x^2+2x，这个蛮简单的
至于第四题...你不觉得拍的角度有些斜吗...
第五题，可以连接AO，有△ADO≌△AEO（HL），然后得到DO=EO，再证△DOB≌EOC（ASA），就可以得出结论了
好啦
绛旓細绗竴棰樺疄鍦ㄦ湁浜涚湅涓嶆竻鎾...绗簩棰橈紝鏈夊钩琛屽洓杈瑰舰ABCD锛屼富瑕佹槸璇佲柍ABD涓庘柍CDB鍏ㄧ瓑锛孲AS銆傜劧鍚庝綘灏卞簲璇ョ煡閬撲簡鍚 绗笁棰樼瓟妗堟槸 2x^3+x^2+2x锛岃繖涓洰绠鍗曠殑 鑷充簬绗洓棰...浣犱笉瑙夊緱鎷嶇殑瑙掑害鏈変簺鏂滃悧...绗簲棰橈紝鍙互杩炴帴AO锛屾湁鈻矨DO鈮屸柍AEO锛圚L锛夛紝鐒跺悗寰楀埌DO=EO锛屽啀璇佲柍DOB鈮孍OC锛圓SA锛...
绛旓細(1)=(3m-2n)(m+n)(2)=4a^-4a+1-6 =(2a-1)^-6 =(2a-1-鏍瑰彿6)鎴栵紙2a-1+鏍瑰彿6锛(3)=-(x=鏍瑰彿2y)^2-y^2 =-(x-鏍瑰彿2y+y)(x-鏍瑰彿2y-y)(4)=(x-2y)(x-y)+(x-2y)=(x-2y)(x+y+1)(5)=m^2-(n-鏍瑰彿2)^2 =(m+n-鏍瑰彿2)(m-n+鏍瑰彿2)
绛旓細鎴戠殑 杩浜旈亾棰姹傝В!澶х!! 1涓洖绛 #璇濋# 鎵撳伐浜哄繀鐪嬬殑鑱屽満銆庣淮鏉冦忔寚鍗!csdygfx 2014-08-11 路 TA鑾峰緱瓒呰繃21.3涓囦釜璧 鐭ラ亾椤剁骇绛斾富 鍥炵瓟閲:9.1涓 閲囩撼鐜:86% 甯姪鐨勪汉:4.8浜 鎴戜篃鍘荤瓟棰樿闂釜浜洪〉 鍏虫敞 灞曞紑鍏ㄩ儴 鏇村杩介棶杩界瓟 杩界瓟 閲囩撼涓涓,濂藉悧?璋㈣阿浜 杩介棶 鍐嶅彂涓閬嶈涔堝垰鍒氶偅...
绛旓細0.125涔樹竷鍒嗕箣鍏=1/8x8/7=1/7 0.5涔樹節鍒嗕箣浜=1/2x2/9=1/9 4.5涔樺叓鍒嗕箣涔=9/2x9/8=81/16 鍗佷簩鍒嗕箣涓冧箻浠0.4=7/12x2/5=7/30
绛旓細浣犲彂浜嗙湡澶氶亶鈥︾◢绛
绛旓細瑙佸浘
绛旓細锛1锛夋眰x瓒嬭繎0鐨勬瀬闄 琛ュ厖f(0)锛濇瀬闄愬 锛2锛墄锛0鍜寈锛1涓哄彲鍘婚棿鏂偣 x锛-1涓烘棤绌烽棿鏂偣 杩囩▼濡備笅锛氾紙3锛夌鍙蜂笉鍙 锛4锛夋眰鏋侀檺锛岃瘉鏄庣瓑浠锋棤绌峰皬 锛5锛夋瀯閫犲嚱鏁帮紝鍒╃敤闆剁偣瀹氱悊璇佹槑 杩囩▼濡備笅锛
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