1…2x+9y=813x+y=342.、9x+4y=358x+3y=303.、7x+2y=52I7x+4y=624.4x+6y=549x+2y=875.2x+y=7l2x+5y=196.(x+2y=213x+5y=567.(5x+7y=525x+2y=228.(5x+5y=65I7x+7y=2039.*8x+4y=56x+4y=2110.(5x+7y=41I5x+8y=4411.(7x+5y=543x+4y=38112.x+8y=153x+6y=2419x+2y=6219x+4y=464x+y=2917.,3x+8y=51x+6y=2718.「9x+3y=99I4x+7y=9519.f9x+2y=38l3x+6y=1820.5x+5y=457x+9y=6921.{8x+2y=287x+8y=6222.{x+6y=1423.f7x+4y=67l2x+8y=263x+3y=2724.15x+4y=5225.7x+y=926.*6x+6y=486x+3y=4227.*8x+2y=167x+y=1128.(4x+9y=7718x+6y=9429.6x+8y=687x+6y=6630.J2x+2y=227x+2y=4731.J5x+3y=83x+5y=832.(6x-7y=5x+2y=433.(10x-8y=1434.J4x+7y=3x+y=035.J3x+y=107x-y=2036.*44x+10y=27x+y=1f-37.*8x-y=0Ix+y=183x+3y=2738.*11x-y=12.11y-x=-1239.f5x+6y=27*2x+3y=1240.J7x-2y=4lx+2y=1241.*(2x+y)-5y=2r2x-5y=042.(7x-3y=33x+2y=2143.(7x+2y=21y-6x=144.410x-8y=0i3x-45.*3x+y=10l5x-7y=846.{3x—2y=1x-y=347.{x+3y=-53x-4y=-248.{y—3x=2x_2y=649.15x+3y=22x_y=350.{9x_3y=122x+y=651.{2x+3y=73x+2y=35x+6y=48055.{3x-2y=57x-4y=1156.«3x-5y=22x-y=357…4x-3y=182x-y=852.3x+2y=18x+y=753.2x-5y=1x+y=354.x+8y=44258.*x-2y=5x+3y=_559.*3x+y=72x+3y=760.*3x_2y=72x_3y=3一、解方程组1I4x-3y二5[4x+6y二142|3x-2y二6'[2x+3y二175、I辛=1-1[4(JC+2)=1-5y3、x+yx一y/+=6224(JC+y)-4J23x+17y=63、[17x+23y=576、Ix+y=4[2x-y=-17J13x-16y=0、[12x+25y=1034x+1=5(y+2)3(2x-5)-4(3y+4)=5|3x+2y二479、13x-2y二1910、x+2=335x2y1125Ix+2=417、12(y—3)=6|x—5y=018、[3x+2y=17|2x+y=119'[2x—y=7[x+y=42011、＜3x—2y=—1213、F-3y=-14x—5y=—173(x+y)—4(x—y)=4＜x+y+x—y=114x+1I-x—322、2122415x-2=2(y-1)2(x—2)+(y—1)=52x+3y丄3x+2y1123、]2+5=亍3(2x+3y)=6(3x+2y)27+2.二、解方程组x+y—z=4、＜2x—y+z=5x—3y+z=—2'3x—2y=82、＜2y+3z=1x+5z=7x+2y—z=63、s2x+y+z=93x+4y+z=181)x+y-z=04、＜2x+y+z=7x-3y+z=82002x-2003y=20052001x-2002y=20042005x+2007y=60192007x+2005y=6017x-3y=52x+y=55)9m-2n=34n+m=-12p-3q=13-p+5=4q|3m-2n=54m+2n=96x-5y=11-4x-4y=70.5x-0.3y=0.23x-5y=74x+2y=511x-9y=12-4x+3y=-5x+2y3x+4y5a3a其中a为常数)211—x一一y23114m-2n+5=01、＜13n-4m=6J0.4x+0.3y二0.73'[llx-10y二12x-1y+1=04'53—2x—lly=3c6x+29y=—7c（c为常数）J—x—4y=3c+d'[4x+3y=2d—cc、d为常数）x—2y=03x+2y=82)=35竺=333x+4y=22x—y=5a+b=3(4)
