1、5x+6y=16 2、5x+4y=142x-3y=1 2x-3y=1

初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 {5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 ｛3分之2（x-y）=4分之x+y-1 6）x+y)=4(2x-y)+16 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 （x-4y=-1 2x+y=16) (x-y=1 2x+y=5 ) 5(X-3Y)-6=2X+1,3(X+Y)=4(2X-Y)+16 3x+2y/4=2x+y/5=x-y+1/6 6x-2y+[5x-2(y-2x)+y],其中x=-2分之16x-2y+[5x-2(y-2x)+y]y=-6分之1 急 在线等x=-2分之1 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 1:4(x-100)+3y=5 2:6(x-y)-2(x+y )=14 x-100=-y 3(x-y)+(x+y)=5 先无视上面的1.4(x-100)+3y=5x-100=-y2.6(x-y)-2(x+y )=143(x-y)+(x+y)=5 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1/90y) ,其中x=1,y=-2 [(x+2y)²-（x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)（x-y）² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的！ 求下列解方程组完整过程{5x=2y① 50x+200y=4400②{2/3（x-y)-x/4+y=-1① 6(x+y)-4(2x-y=16② 已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 （X+Y)^2 X^2Y+XY^2注：*/* 是分数