2022-2023学年北京市东城区七年级上册数学期末试卷（四）含解析

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2022-2023
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-8+a=-4-l,஺=3.ᦑᫀ3.⚪ὃᐗ

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ḄêëìíᑖîஹíÜÝஹV⚗ஹᔠ¦]²⚗ஹðᦪᓄA1.ஹ⚪(⚪8ᑖ஺ᐳ16ᑖ)132——xy19.ᓄáP:çè(x-3)2+|y+|=0,3x2y0[2xy2(32(xy2)+3xy]+5xy?ḄP.2.ூ௃B⚪ᑖ᪆ᙠûIᦪ;ýᑁÿᦪḄᦪᦪḄᦪ.ᦪᦪᙳ.⚪ᩩḄ!"#$Ḅ%ᑖ'()!*.ᵫ*ᨵḄ!*ᨵḄ!*ᦑ./ᐗ12ᓽ.45ᩩḄx,yḄ.:;<Ḅ=ᦪ">?ᓄAB=ᐭx,yḄ<ᓽ.D⚪2᪆F(H:Jᑡ2᪆L1ḄMᐵOPᙳ▲RᙠTᦪUWᑁ)<245ᩩḄḄ.(X-3)2+J^+1=0•r\•.•:*ḄḄIJ/3ᙳᡂaH=°,ᓽ…஺,ᵨ=஺1y=—2iP1.j=3,3.ᓄA;<Ḅ"k.3x2y-2xy2-2(xy--x2j|+3x^+5xy28

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ᵨᡝ⁚ᵨᢥᦈ:ᵨ/ᨴᓫᐗ/ᔴᨵ40ᔴḄ$ᑖ140ᔴḄ$ᑖ1.5)*+ᔴᵨ,ᦈ0.2ᐗḄ./0ᜐᳮ13ᵨᡝ1ᨴ4ᐳ665ᐗ81ᨴ4ᵨ9:ᔴ;2<=ᵨᡝ⊤ᨵᦑ@+AᵨBᨵ60%DᐭᵨF᪵ᙠ2ᨴ4643.2ᐗ=ᵨᡝ2ᨴ4J▭L69:ᐗ;150ᔴ282ᐗூPQ௃S⚪ᑖ᪆*1ᐜᵫ40xl+0.2x40=48<65ᑨ^_ᵨ40ᔴ`1ᨴ4=ᵨᡝ11

11ᵨXᔴb᪷d⊤eḄᦈ᪗gᓽiᑡklmQn(2)ᵫ40xl+0.2x40=48>43.2,isDᐭᵨḄ43.2+1.2=36ᔴ,ᑣiuJ▭ᵨ364-60%=60ᔴb᪷d⊤eḄᦈ᪗gᓽimuwx.S⚪Q᪆*Q*(1)•••40xl+0,2x40=48<65•••ᵨ40ᔴ.`1ᨴ4ᵨxᔴᵫ⚪zu*40x1+(x-40)xl.5+0.2x=65Qu:x=50{*1ᨴ4ᵨ50ᔴ.(2)Q|}*v40xl+0.2x40=48>43,2ᵨᨵ40ᔴ.`2ᨴ4J▭ᵨyᔴᵫ⚪zu*lx60%y+0.2x60%y=43.2Qu*y=60•••40x1+(60-40)xl.5+0.2x60=82(ᐗ)Q|:ᵨ40ᔴḄ᎛(1+0.2)x40=48(ᐗ)ᵫ43.2<48ᵨᡝ2ᨴ4ᑮ40ᔴ43.2+(1+0.2)=36(ᔴ)+AᵨBᨵ60%ᐭᵨ=ᵨᡝJ▭ᵨ36+60%=60(ᔴ)(1+0.2)x40+(1.5+0.2)x(60-40)=82(ᐗ)ὃ*}ᐗklJ▭8⚪24.᝞Ḅ⚔OᙠABOC,ODḄᩩOEᑖ/AOD.12

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