2021-2022学年广东省湛江七年级（下）期末数学试卷（附答案详解）

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2021-2022
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7•b=—7,•2Q+b=10—7=3,2a+bḄOÖ᪷d±VIᦑ⌱D.ᑭᵨ᪷᪷᪷Ḅឋ.⚪ᵨ᪷᪷᪷Ḅឋᐵ⌕.11.ூ"ᫀ௃7ூ᪆௃ூᑖ᪆௃᪷'᪷Ḅ().⚪*⌕ὃ,᪷ஹ᪷ᭆ/Ḅᵨ.᝞122=a(aN0),ᑣx=஺Ḅ᪷.?a>0,ᑣAᨵCD᪷ᡃFGHḄ᪷I஺Ḅ᪷J?a=0,ᑣAᨵKD᪷ᓽ0Ḅ᪷=0.0Ḅ᪷M=0JNᦪPᨵ᪷.ூ"௃:72=49,49Ḅ᪷=7.ᦑ"ᫀU7.12.ூ"ᫀ௃ᚖWXᨬZூ᪆௃ᑜG\]^Ḅ\_ᑮ\a”^cdMfABḄᚖWᯠjkCMm]ᑣnopmḄ]⍝ᨬZrstᫀḄ᪷'=ᚖWXᨬZJᦑ"ᫀUᚖWXᨬZ᪷'ᚖWXḄឋᚖWXᨬZ"ᓽ.u⚪*⌕ὃ,ᚖWXḄឋᐵ=vwឋᑁy.13.ூ"ᫀ௃8ூ᪆௃(125-51)-10=7.4“8()ᦑ"ᫀU8.᪷'ᦪ=(ᨬᜧ-ᨬ)K"ᫀ.⚪ὃ,⚣ᦪᑖ⊤ḄᑴfvwᦪḄᐵ=HᑖḄᐵ.14.ூ"ᫀ௃(8,-9)ூ᪆௃ᵫ⚪(d2(—2,3)ḄdUC(4,—5),ᓽdA=ᔣ6Dᓫᔣ8DᓫᑮḄdC,ᡠ8(2,—1)ḄdDḄᙶ᪗U(2+6,-1-8),ᓽ(8,—9).ᦑ"ᫀU(8,—9).8⚓ᐳ14⚓

8ᵫ⚪(dA=ᔣ6Dᓫᔣ8DᓫᑮḄdC,¡¢"ᫀ.⚪ὃ,ᙶ᪗^dஹWXḄ£¤ᙠ☢§¨ᙶ᪗^©ªḄ«©ª¬dḄ®¯.^dḄ°ᓄ£¤=²ᙶ᪗³´µJ¶ᙶ᪗¬³µ.15.ூ"ᫀ௃2+·ூ᪆௃¸¹=2+3-(3-b)=5-3+73=2+V3,ᦑ"ᫀU2+·.ᑭᵨ᪷᪷ºḄ()"ᓽ.⚪*⌕ὃ,»ᦪḄ᪷᪷ºḄ()Hᑭᵨ¬¼ᑣ«ឋ"=⚪Ḅᐵ.16.ூ"ᫀ௃½ூ᪆௃••ᐵ¿xḄÀÁ¹Â:4ḄÃ=x<4,4.2—m<0,m+2>0,•••P(2-m,m+2)ᙠ½Ä▲.ᦑ"ᫀU½.ᑭᵨÀÁ¹ḄӯƔᑮm24,¡ÇdÈḄ²ᙶ᪗«¶ᙶ᪗ḄÊË¡¢dPᡠᙠÄ▲.⚪*⌕ὃ,ÀÁ¹ḄÃÌdḄᙶ᪗᪷'ÀÁ¹ḄâÍḄÆÊ="⚪Ḅᐵ.ÀÁ¹ḄÃḄ£¤¯ᜧÆᜧJ¯ÆJᜧᜧ^ÎÏJᜧᜧÏÀᑮ.17.ூ"ᫀ௃(4040,2020)ூ᪆௃:ÐÑÒÓ:d4(0,0)d4(2,1)d4(4,2),dÔ¹6,3),…4n(2n—2,n-1),•••42஺21Ḅᙶ᪗U(4040,2020),ᦑ"ᫀU(4040,2020).᪷'ÕdḄᙶ᪗⊤Ö¢஻DdḄᙶ᪗UAn(2n-2,n-1),ᯠjd4021Ḅᙶ᪗ᓽ.⚪ὃ,dḄᙶ᪗⚪Ḅᐵ=ÏᑮdḄᙶ᪗Ḅ°ᓄ£¤ØÙ^Á.

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1021.ூ6ᫀ௃/:(1)᝞;ᓽ=ᡠ?;A)'r-|—τ—τ—i6irτrL(2)Ai(3,6),Q(l,2),Ci(7,3);(3)4BCḄ☢B=4x6-|x2x4-ixlx6-ix3x4=24-4-3-6=ll.ூ/᪆௃(1)᪷EFḄឋ)ᓽGFHḄ(2)Iᔠ(1)ᓽᑏA&B1QLM⚔OজஹB(ஹ6Ḅᙶ᪗.(3)᪷ETUIᔠ(2)ᓽ?V2BCḄ☢B.⚪ὃ"#W;-FYᣚ/[⚪Ḅᐵ1.\]FḄឋ).22.ூ6ᫀ௃/^(1)300(2)12030%(3)3000x(40%+20%)=1800(A).6^_᪥ab3000cdᡂf=“gh”Ḅᜧj.1800c.ூ/᪆௃(1)30*10%=300,ᦑ6ᫀ=:300(2)m=300x40%=120(c)71=90^-300=30%,ᦑ6ᫀ=^120,30%

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