2x+3y-1=x+6 { y-x-8=x+6(二元一次方程） 3x+2y=1 2x-2y+2z=-5 x+2y-z=3(三元一次)x+2y=-112x/0.5-10=y(二元一次)

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=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 解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 2x+3y-1=y-x-8=x+6 ,y=? 2x+3y-1=y-x-8=x+6,则x= 9y=3x-(x-1),4(x+y)-(2x+4)=8y 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 解二元一次方程组：3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1 (x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2 (x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题 (x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20