2019-2020学年四川省甘孜州七年级（下）期末数学试卷（北师大版）（附答案详解）

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2019-2020
ḕᵞ
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710.ூᫀ௃Dூ᪆௃ூᑖ᪆௃⚪"⌕ὃḄSÙḄâ.ḄSÙhḄ⚔ḄᚖäÈÔÒḄäÙᡈᩩäÙ1E⚔ᑮÊÔÒåÌPḄÙÚ.ூ௃`COBCDjBCÒ1ḄSÐXAABCḄS.ᦑ⌱D11.ூᫀ௃4ூ᪆௃ூᑖ᪆௃⚪ὃæ᦮ᦪᢣᦪéḄêᐸêឋ/^⚪Ḅᐵᓽæ᦮ᦪᢣᦪë`a~p==0,pbz᦮ᦪì.᪷-æ᦮ᦪᢣᦪíÈz᦮ᦪᢣᦪíḄ᎔ᦪïLᓽ.ூ௃`ðᓝ2==4ᦑᫀb:4.12.ூᫀ௃2ூ᪆௃`o'`^'eᩩäÙÔᢚÁX*óᐰÄᔠ^'XôÔõ'§ᔠ⚪¦yoö'`^'eᩩäÙÔᢚÁ*óᐰÄᔠ^'ôÔõ'X§ᔠ⚪-1V-÷yo'`^'eᩩäÙÔᢚÁX*óᐰÄᔠ^'XôÔõ'§ᔠ⚪¦yoø'`^'eᩩäÙÔᢚÁ*óᐰÄᔠ^'ôÔõ'X§ᔠ⚪឵.ᦑᫀ`2.᪷-ôÔõ'ḄâeᩩäÙÔᢚÁäÙúûᑖᐰÄᔠḄ'ôÔõ',ᓽᑨ3.^⚪"⌕ὃ$ôÔõ'Ḅâ᪷-â23'üý⚪Ḅᐵ.13.ூᫀ௃-56ூ᪆௃`᪷-⚪¦2`!k=5,n+l=7,2`k=—5,n=6.ᦑᫀ`—5,6.᪷-ᓫ⚗ÿᦪஹᦪḄᩭ.ᓫ⚗ᦪᦪᓫ⚗Ḅᦪᡠᨵ8⚓ᐳ13⚓

8Ḅᢣᦪᓫ⚗Ḅᦪ.⚪ὃ"#ᓫ⚗Ḅᦪ$ᦪ%ᓫ⚗Ḅᦪᦪ&'(ᓫ⚗ᑖᡂᦪᦪḄ+,-.ᓫ⚗ḄᦪᦪḄᐵ0.14.ூ4ᫀ௃9ூ᪆௃ூᑖ⚪9⌕ὃ";<=Ḅ☢+?@;<=ḄA;<=ḄA';<=Ḅ☢+ᑖBCDḄEFᑖ,⚪Ḅ9⌕GH.᪷JDKDLḄE;<=☢+CDM;<=ḄA';<=Ḅ☢+ᑖBCDḄEFᑖᡠ?N4DCḄ☢+,AABCḄ☢+Ḅ(Sᓽ9cm2.ூ4௃XSA.DC-SMBC+2=18+2=9cm2.ᦑ4ᫀB9.15.ூ4ᫀ௃x52aூ᪆௃XX2-X3=X5;4a2b+2ab-2a.ᦑc2a.᪷JdKᦪeCfKᦪghᢣᦪCijᓫ⚗Ḅ◀llᑣnoᓽp.⚪9⌕ὃ"dKᦪqḄflᓫ⚗Ḅ◀lrstuvoឋxlᑣ,⚪Ḅᐵ0.16.ூ4ᫀ௃X(1)-1+(—}-2((3.14—ᐔ)°=-14-4-1=2j(2)2(y6)2-(y4)3=2y12—yi2=y12(3)(-2x2y+6x3y4-8xy)+(-2xy)=2x2y+2xy-6x3y4+2xy+8xy+2xy=x-3x2y34-4.ூ᪆௃(1)ᐜᓄᔜᯠnoᓽp4j(2)ᐜofoflolᓽp4j(3)ᑭᵨ⚗◀?ᓫ⚗Ḅlᑣnoᓽp4.⚪ὃ"#᦮Ḅ◀l᦮ᦪᢣᦪeᢣᦪeeḄf$+ḄfrstuḄvolᑣ,⚪Ḅᐵ0.17.ூ4ᫀ௃XvDE//AB•Z.BAD=Z-ADE=30°,

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11¦§Ḅᩩ§©Ḅ«X¬°f5,2.25.ூᫀ௃஻=NCᡈ48=4஺ᡈ4B஻CDூ᪆௃JAOBgC஺஺|'AB=CD,AOB=LCOD,¹º»4=ZTᡈNB=4஺ᡈ4B஻CD,•••/AOB^LCOD.ᦑᫀQJZA=NCᡈ48=/LD^AB//CD.⌕l¼AOB^LCOD,½¾AB=CD,NB04=DOC,ᐹᜓÁr#ÁÂX¯'ÃÄÅrᡈÂX¯ḄᩩÆ'Çᔠᑨz"bÊ°fËÌ⌱ÎᓽI.⚪ὃÂfᐰḄᑨz"b@ᑨz8ÂfᐰḄe"bᨵJSSSஹSASஹASA,AAS,HL.ÏÐѵ2JAAAஹSS4CÓᑨz8Âfᐰ'CÓÏÐ'᪷4½¾Çᔠ°fÊᑨz"b⌱ÎᩩÆ[Ô⚪Ḅᐵ±.26.ூᫀ௃JÕÖ°×I¾J(1)ØØᑮÙÚÛᨬÝḄᙢ"ᙠ12Ñ'ÑÚÛ30ᓟá@(2)10´âÑãätåæç@æçâZÑ@(3)ØØèéêë|'ᔜÑíḄîïᑖ;QJ9"10Ñ,îïQ10+(10-9)=10ᓟá/Ñ;10"10.5Ñ,îïòQ(17.5-10)+(10.5-10)=15ᓟá/ZÑ@10.5"11Ñ,îïQ0#11"12Ñ'îïQ(30-17.5)+(12-11)=12.5ᓟá/ZÑ@12"13Ñ'îïQ0#13"15Ñ'ᙠóôḄ⌶|'îïQJ30+(15-13)=15ᓟá/ZÑ@Iö÷ÌᨬøᨵíÑJ10"10.5Ñ@13"15Ñ.íÑḄîï15ᓟá/ZBù.îïQJ30+(15-13)=15ᓟá/ZÑ@(4)ØØᐰë÷úḄᙳîïQJ(30+30)+(15-9)=10ᓟá/ZÑ.ூ᪆௃(1)ᑭᵨ°|Ḅ´Ḅüᙶ᪗⊤dÑ'ÿᙶ᪗⊤Ḅᫀ(2)ᙠḄ(3)ᐰᩭ᎛#$ᨬ&ᵨ◀)ᡠᵨᓽ,(4)ᵨ--ᐰ.ᡠ/Ḅ◀)ᡠᵨḄᓽ,.1⚪3⍝5ᦪ78Ḅ9Ạ⚪;⚪Ḅᐵ=>?@ABC78D᦮ᳮ;⚪ᡠ◤ḄHᐵIJK1⚪L▭NὃPQRSḄT7UV.27.ூᫀ௃;Y(1)ᵫ[ᦪ\x]^5,y]^3,ᓽ_`aᓣc5࠷,d#3,ᦑyfx3^5ᦪᐵgᑣiy=kx+b(k*0),j12⚓ᐳ13⚓

12•,p=()y-331,%=5y-334,.(b=331**(5k+b=334f;yzᡠ)y=0.6x4-331(2)x=150y=0.6x150+331=421,y=3520.6x+331=352,;—35.Y=150࠷d#y421m/s,d#352m/s_`x350c.ூ;᪆௃(1)BC_`aᓣc5࠷,d#3,ᯠiy=kx+b(kR0),ᑭᵨgᦪ3^5ᦪ;᪆;ᓽ,(2)xḄᐭᐵgyḄyḄᐭᐵgxḄᓽ,.1⚪ὃP3^5ᦪḄ¡ᵨ9Ạ⚪¢⌕ᑭᵨgᦪ3^5ᦪ;᪆¤¥¦§¨5ᦪf©¥5ᦪ¦§¨.28.ூᫀ௃«¬«®©¥¯ᐳ¬SASQCBEBC«®«¬ூ;᪆௃;Y•.•48=AC,/.ABC=¶4cB(«¬«®)•••DB=CE(©¥)BC=BC(¯ᐳ¬)/BCD@ACBE(SAS),DCB=/.EBC,.OB=0c(«®«¬).ᦑᫀY«¬«®©¥¯ᐳ¬SAS,DCB,EBC,«®«¬.᪷\«Ὺº®»Ḅឋ½¾¶4BC=¶4CB,¿ÀBCDÁACBE,¾NDCB=NEBCᓽ,.1⚪¢⌕ὃPᐰ«º®»Ḅឋ½Ãᑨ«Ὺº®»Ḅឋ½Ãᑨ«¥TÅḄᳮ;ÃÆÇUÈÉᙢËᵨឋ½/Ìᳮ;K⚪Ḅᐵ=.