2021-2022学年广东省湛江市廉江市八年级(上)期末数学(解析版)

Q2-QC-Qb+bc=O,‡ˆlABC‰Š.EvaluationWarning:ThedocumentwascreatedwithSpire.PDFfor.NET.\r/012(1)‹ŒŽ\r0\r‘#’}I“”M=#•’}I\r–C—˜0L\r}I™m\r(2)€ŽJƒ\rš›œIžŸ0L}I\r:;¡¢}I£?0¤¥DEd¦J\rKjDQub&cM=F©\r–Cª«l4BC‰Š.\rLR(1)2a+6b-3am-9bm\r=(2a+6b)-(3am+9bm)\r=2(a+3h)-3m(Q+36)\r=(a+3b)(2-3m)m\r³2a+6b-3am-9bm\r=(2a-3am)+(6b-9bm)\r=a(2-3m)+36(2-3m)\r=(2-3m)(Q+3b)m\r(2)Va2-ac-ab+bc=O,\r(Q2-QC)-Cab-be)=0,\r(a-c)-b(a-c)=0,\rCa-c)(Q-b)=0,\r.'¸Q-c=0³Q-b=<,\r.¸V=V³a=b,\rY¹vº‰.\r25._`\r?Ÿvº‰\rfgBC˜bD,fg¼4˜bE,AE=BD,¾ECu\rED,jkRCE=DE.\r/012¿fgBD=F,À0Á=\r¾EKDE48B?Ÿvº‰\rÄÅj\rEAECBÇlEDF,ÉÅDEEC=DE.\r/L^2kpRfgBD=F,ÀDF=BC,¾EF,EvaluationWarning:ThedocumentwascreatedwithSpire.PDFfor.NET.\rJAE^BD,lÊBC?Ÿvº‰,\r:.BE=BF,NB=60°,\r.\n.?BEF?Ÿvº‰\r+.ZF=60°,\rË?EDFÌ\rBE=EF\r<ZB=ZF=609,\r,BC=DF\r/.?ECB^AEDFC,\r+.EC=ED.