1：8x-8y=3x+3y-126(x+y)=4(2x-y)+16这是第一题,一个式子2：x-2y+z=92+y+3z=103x+2y-4z= -3二楼第二个式子错了。

9y=3x-(x-1),4(x+y)-(2x+4)=8y 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x {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 (x+y)/y=8/3则x/y=__ y/x-y=___ (x+y)/y=8/3则x/y=__ y/x-y=___ 例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3 12y(x-y)^2-8(x-y)^3=? {x=1+y 3x+2y=8 1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1, 解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1 3分之2(x-y)-4分之x+y=-1 8(x+y)-4(2x-y)=16 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8) 2x+3y-1=y-x-8=x+6 ,y=? x+y=8 2x-y=1 求3x+5y (2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 解下列方程组：{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 化简y=|x-1|+|x-4|-|3x-8|