2.21...1.2..1.2..1.a2+b22aba=ba0b0,aba=b.1basicinequality.abab..:a2+b2=2ab.2.1a0,b0,ab21a+b22a+b-033-2044.a=b4.1ABCABAC=a,BC=b.CABDEADBD.tADtDBD2ABD.CDCab.1.abab.2.abab...1x0x.xy0=x0x0xy.x+x=1.xy0=2.x0x=2x=x2=1x=12.x0x2x==1x=12xx0y02x=y0y.xx031100m2236m1.22.44800m23m.1501203m...xmym2.z=150+12023x+23y=240000+720x+y.4800m33xy=4800xy=1600.z240000+7202x=y=40z=297600.40m297600..3.4..4.a2b22abab.abab.().abab2..(1)(2)(3).