P=xQ=yRz>1.20+21+22纹Z (0)L002,60-22)303$xdyd2tydzdx+2'dxoy弟二=(3x39732)dv8olyl2+yelex42any3a"dv304g+2dvD318+g+好y0=30#元03uas一=4x,由高斯公式原2o4h0r
三解添加辅助面2Z20 （a)2QP=72* 8:#9z R=1ty2ar(yddeedasd+dz+sydds+Chy2dsdyna cyz)dyfna-na艺作确助向2=0 (xya)取下明全p-z8=xg-2*R=1-y三原=川2dids$exdgdarydJedopdelornodr-Jds228Js(z+xgd2Fh-a?ndeedaashC
四、22R=b-z3仅=2ty图.P=2xz*R=b-23Q=zytyaf8發证EZH%创=-2计vFedaoppDdo Spde JidzC0=忆二元原贝B222549.azyz+(2(d20y=8元读书使人心明眼亮4-80-11
1:2X+24+7323+7+6元2原=6x+3+320V=3++20=22404原式二730V=二原=(2x+ydv-av=an- 元a原= (22+ 241-32)v==0ad=元四L
1.2+21+2z2.22+4了+3元二：井yd2+（+=$13332do=32 do(3defa2ngdr232元2元5-2原式（+0=（d033=8元三：原式=++=2++d=0de5de5asnodr元as四解22+32元号n