北京市海淀区海淀实验中学2021-2022学年七年级下学期期中数学试题（含答案解析）

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ᓽ(2)ᑭᵨḄ☢ᑡᓽ(3)✌ᐜACḄ᪆"#஺Ḅᙶ᪗'ᑖ)*+,-#Pᙠy123'4P(0,m),-#Pᙠx123'40),ᑖ9᪀;<=ᓽ.(1),#8ᙠx1AB12'CAB=3,.,.-1+3=2,...#BḄᙶ᪗H(2,0)ᦑᫀH,(2,0)(2),.BCḄ☢=x3x4=6ᦑᫀH,6(3),4ACḄ᪆HMN+ᓃ'(-k+b=0PAஹCḄᙶ᪗Rᐭ,L'[k+b=4,b-2...ACḄ᪆H,y=2x+2,4ACUy1ḄV#W஺'ᑣ0(0,2).-#Pᙠ)'123'4P(0,Y)'ᑣᨵgxW-2|x(xC-x4)=6,/.\m-2\=6,tn=8ᡈ4.P(0,8)ᡈ(0,-4).-#PᙠX123'4PG,0),ᑣᨵJx|r+l|x4=6,d2ᡈ-4,ᫀe10⚓'ᐳ13⚓

17.P(2,0)ᡈ(-4,0).h2ᡠj'klᩩnḄ#PḄᙶ᪗Ho(2,0)ᡈ(-4,0)ᡈ(0,8)ᡈ(0,-4).ூ#q௃s⚪ὃvwxyzᦪ|}~ᦪḄ᪆'Ḅ☢'ᙶ᪗UḄឋ#'ᵨᑖ+W⚪Ḅᐵ.26.(1)᪆(2)ZMNE=p+a,(3)᪆'ZENM=180°-2ZENGூᑖ᪆௃(1)᪷⌕ᓽ(2)ᑭᵨḄ᜜ḄឋḄឋ⚪ᓽ(3),ZENM=180°-2ZENG.ᑭᵨḄ᜜Ḅឋ⚪ᓽ.ூ௃,(1)᝞ᡠ.A1(2)VDE/7OB,'/MDN=/AOB,ZMNE=ZOMN+ZMDN+a.(3),ZENM=I8O°-2ZENG.ᳮᵫ,᝞'4/NGO=>V2ZNGO+ZOMN=180°,.,.2y+p=180°,ᓽp=180°-2y,NENM=a+B=a+180°-2y=180°+a-2y,YZENG=ZDNT=ZMTN-ZADF=ZAOC+ZNGO-ZADF1=7a+y-a1=y-2a,ᓽ2o2NENG+a,/.ZENM=180°+a-(2ZENG+a)=180°-2ZENG.ᫀe11⚓'ᐳ13⚓

18ூ#q௃s⚪ὃvw£¤ᣚ'Ḅឋ'Ḅ᜜Ḅឋ'⚪ḄᐵW¦§¨©ªs'«¬ὃ®ὃ⚪¯.27.(l)d(#஺'²ABC)=2(2)0°Wa*5°ᡈ135°

19-GËÌ#(-1,-1)3'3”(G,ZkABC)=1,3MNUx1AB1ᜳaH45஺''0°a*5஺ᡈ135°