...2(X+8)=3[X-1]8Y-3[3Y+2]=62X-2/3[X+3]=-X+3再补充一题...2[10-0.5Y]=-[1.5Y+2]

9y=3x-(x-1),4(x+y)-(2x+4)=8y x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= {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=1+y 3x+2y=8 2x+3y-1=y-x-8=x+6,则x= 1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1, 3分之2(x-y)-4分之x+y=-1 8(x+y)-4(2x-y)=16 解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1 12y(x-y)^2-8(x-y)^3=? 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 2x+3y-1=y-x-8=x+6 ,y=? x+y=8 2x-y=1 求3x+5y 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+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 （x+y)+(2x+1/1*2y)+(3x+1/2*3y)+.+(9x+1/8*9y) x=2 y=90求和 化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=? 设集合A={x|x=y^2-2y-8},B={x|y=-x^2+2x+3},C={y|y+1