初中數(shù)學(xué)?？贾R點(diǎn)匯總

222211.1.2221y(x22x知識點(diǎn)：特殊三角函數(shù)值3=.2+=22+==+=....2.ACx12.2x12.12121212.Cxx12121212.233ABCxx12122A...2.2..22.2.22x2x2,令=.x3x22222x2令=.x3x22222xxx.2222yx2x.21.1.1.1.2.2x.82x82xAOABDC?OABDCBD.CA?OB.DCAC.O?.BDBACC?BA.OO為.A.lA.O,PA.l個個個aa..2.A.....121212121212.1212OO和43.12.1212....12121212知識點(diǎn)：正多邊形和圓Oππ.10.3.2.°.1R2.C2C2C2.3.CCC.2.323知識點(diǎn)：函數(shù)圖像問題2yaxbxc23bxc..2.2.x10.x.2..1c且c、2212.31233122313211324).xyx2y2yx12)2（.1aaaa2222.x2x1xxx11)).x211xx11.xxxxxx1xy.xyyxxyx2y22(xy)的正確結(jié)果為xyy22x221.xx11xx4x).x2x22x111.yyya.a2a1若a.aaba(ab)2.aax3.a(ab)2.aaa2則xy.xya(ab)2.aaa2ba.aaba.a21a2b3.abb2xm3.2x13.2x111x2xy.x2xx2222.22ax1x.12231--、.2222.23333且32222..121211k42x123?y?y31223131323m6.11222112x2x.21122xy隨x,y12121122個個y.kx.1(，ymmx.ky.y112212x.,是...A.種種種種.7.A.下A...,,.8765.頻率49.559.569.579.589.599.5100組距14.512.526.53）54＿＿8＿.＿4＿＿810..成績49.559.569.579.589.599.5100ABCD.分?jǐn)?shù)49.559.569.579.589.599.5格人數(shù)8為.2ABCD）成績1.591.791.992.192.392.591①較則..16.316.3110%.元元元元.元年月1年6月1幣.a.元元元元.A.%22mnmn%9,元,元,為.元元元元年月1即存款到期后利息的年月51.B元A知識點(diǎn)：圓中的角CO2DOOOA121.°PEDBCDAB°°°.°．O,CDOBODC.°OAC且，EC.D°°°?OAAEBO.E°°DBCDC.·BPAOAD.°BC∠1212oBCA.??ooP12,3）2為2,3）AOBP4,,A3,為23米3米米.MN米ADBEC6于E7.33AB··C12OO12ROO.．2212EFB．2D33ABOOOOOOOOC211212121OOO過OO于D：12211OO.12753D.132?DACBOOAOO且POO112121PO于B，則.B2PA1254BPC4AB21211ACRAB=.122R2OO1?2DC1212AE.F?OCBDDC.E1414ABP.CDOO12AB95OOPOOBPO12121OD.21124)知識點(diǎn)：數(shù)形結(jié)合解與函數(shù)有關(guān)的實(shí)際問題O.y升)1107110210342439352分)O57第7.112天數(shù)天天天天.O時間(分)O816243yt是.yyyyy(元)xxxxABCDOOOO公斤）OS(百米).分鐘)O121333始5y()t()3595OC．3．33小時)O.9036y123.O1y=ax+bx+c；②a2y122A.xO1y2是.xOcxxy211.個個個y2是.xOb(1,-2)A.1xOy=ax+bx+c;;.2.y2cxOy2122222xAB-1Oy2.2CxBOAy2c222AxD┙1┙EBC·O.AFE?H.BMDCNPOC.2AOCED.PFBC.EO；P=.DFBAPACE·FO.2B④rM.FACD212121B121EP2A.?2O1O2PBDC1221212.2E12,POPBCO于CO于ADDAFN.M?OPCBE1212P12.O；2EF21ABCD.22x..32x.22x22=.322.22x..22x=.332222，，5，，.4,.*********.?????????????????P，a411113a，16221122A7a64，33121233BC.1155BC22BC33BPC??????????1111213311a.1222.A332333233332FE·O.3333DCPBCABPADO為O于P.BDCGF.ABCD是.O交于DE為BO2DC.O?AEB是.AFO?.BEC