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4401ABCD2{abc}A7B8C9D103{12}A{12345}AA.6B.7C.8D.94U={1234}M={12}N={23}CUMN=A.{123}B.{2}C.{134}D.{4}511xyxy()A.{x=0,y=1}B.{0,1}C.{(0,1)}D.{(x,y)|x=0y=1}6000Q3.0,N0,,,abba2|20,xxxZA4B3C2D17M(x,y)xy0()A.B.C.D.8A=12xxB=xxaABaA2aaB1aaC1aaD2aa9M1=1,2,3MA1B2C3D410|2,PxxkkZ|21,QxxkkZ|41,RxxkkZ,aPbQAabPBabQCabRDabPQR11}4,3,2,2{A},|{2AttxxBB12A={x|x2+x-6=0},B={x|ax+1=0},BAa=__________13U=22,3,23aaA=2,bCUA=5a=b=1433|xxxA41|xxxBAB____________.15A={x|20xxm},AR=m165040314.17A={x|x2+2x-8=0},B={x|x2-5x+6=0},C={x|x2-mx+m2-19=0},BCAC=m18f(x)=2xaxb,A=()222xfxx,f()x191,1AB=220xxaxbBABAab20,xyR23,Axxyy21,3BxxyxA=Bxy440DACDCCDABB318114,9,161211,,03213a=2-4b=314|34xxx1514m16251040174,2,2,3ABBCAC=3C293190mmm1=5m2=2m2=218()222xfxx22xaxbx221212244484xxaxxb42484abfx=x2-42x+48419ABAB111,1B1B220xaxb111abB1220xaxb111ab1,1B220xaxb1101ab20A=B221,33xxyyxxyx32xy16xy