2021年全国高考乙卷数学（文）试题（解析版）

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17(2)✌ᐜᦪ.ᙶ᪗&1Ḅᑗ345ᯠ6&7⚪9ᓄ;45Ḅ7⚪<=ᓽ#>ᐳ1ᙶ᪗.ூ@௃(1)ᵫᦪḄ᪆#Bf'(x^3x12-2x+a,ᦪḄᑨuv=412a,xv=4—12“KO,a2B{(x)Z0,/(x)ᙠRIᓫ(⌴F,xA=4-124>0,஺0,/(x)ᓫ(⌴FVI3)xXI1,ᓃ2{r(x)0,/(x)ᓫ(⌴FVI#Bx{/(x)ᙠRIᓫ(⌴F,|,,ஹ/1—Jl—(l+Vl-3nx{/(x)ᙠ8,---,---31JJIJ1—Jl—3a1+-Jl—3aᓫ(⌴Fᙠ.-,——-——Iᓫ(⌴J.33(2)ᵫ⚪L#B/(y)=/ᱏ+Q+1,RS)=3ᱏ-2X(,+a,ᑣᑗ345;By—(XV-W+ax+1)=(3⃁—2x+a)(x—x஺)Q0ᑗ3.ᙶ᪗&1ᑣB0-(ᱏᱏ+[)+1)=(3ᱏ-2x()+a)(O-%)᦮ᳮ#B2^-X^-1=0,ᓽB(/-஺(2ᱏ+%+1)=0,Bx0=l,ᑣ=1-l+a+l=a+l,/'(/)=/'(l)=l+aᑗ345;By=(a+l)x,b/(x)=X3-x:+ax+1ὶdx3-x2++1=(a+l)x,ᓄeY/g+1=0,ᵫhᑗ1Ḅiᙶ᪗1jᯠkl45Ḅm᪷o(p1)kq2—x+iḄms

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19,஽=±[ᡠAᑗ5Jir-3y+3-4_=0ᡈJIx+3y-3-4_=(),dx=/?cos6,y=psin8iᐭᓄ'2/7cos(e+q)=4—6ᡈ2/?cos(e-g)=4+6ூoᨒ௃q⚪r⌕ὃu!"ᙶ᪗᩽ᙶ᪗Ḅ#ᓄvᑮ!ᙊḄwxᐵzὃu{|Ḅᦪ{}~I⍝Ạ⚪.[⌱4—5:V&⌱]23.ᦪ/(=I஺|+,+3].(1)஺=1V&26Ḅ,(2)஻x)>-a,aḄ.ூᫀ௃(1)(F,T]U[2,M).ফ1*).ூ,᪆௃ூᑖ᪆௃(1)ᑭᵨ¡¢Ḅ£¤0¥V&Ḅ,.(2)ᑭᵨ¡¢V&ᓄ'/(>I஺ᵫ¦aḄ.ூ+,௃(1)a=l/(x)=|x-l|+|x+3|,|x-l|+|x+3|⊤¨ᦪ©Ḅoᑮ1ª—3ḄTU«ªᑣ/(x)>6⊤¨ᦪ©Ḅoᑮ1ª-3ḄTU«ªW6,x=Yᡈ¯=2ᡠ¢°Ḅᦪ©Ḅoᑮ1,-3ᡠ¢°ḄoTU«ªVW6,...ᦪ©ᑮ1,-3ᡠ¢°ḄoTU«ªVWᜧWVW6ᑮᡠ¢°Ḅᙶ᪗ḄxWYᡈx22,ᡠA/(x)26Ḅ,5(-00,-4]U[2,-+w).-6-5-4^3-2-1T°1234(2)µ⚪0a,ᓽ+|x+3]>—aឤᡂ¸|x—tz|+|x+3]=|tz—A^+|x+3|^|tz+3|,½¾(a—x)(x+3”0VÀÁ=|a+3],

20ᦑÃ+3]I஻ᡠA஻+3I஺ᡈ஺+3VQ,3,ci—.2ᡠA஺Ḅ-j,+8ூoÄ௃,¡¢V&ḄÅᨵÇoᑖÈÅஹ£¤0¥Å.,ÊᨵËÌ¡¢½ᐸÎḄXḄzᦪÏVAὃ⇋ᑭᵨᦪ©¡¢Ḅ£¤0¥,ᑭᵨ¡¢Ñ"V&ᨬÓÔÕḄÖ⚪[0⊤×VÀḄᩩÙ.

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