6/x+6/y=1/2和8/x-3/y=3/10 求x=?y=?

(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= (2x-2y)/3-(x-y)=-1和6(x+y)-4(2x-y)=16 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1kkkkkkkk 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 6/x+6/y=1/2和8/x-3/y=3/10 求x=?y=? x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1 求解简单的二元一次方程组x=3y-2和y=2x-y 2x=3y-12和4y=2x+1 3x-13y=-12和x+3y=2 2x-5y+13=0和9x+6y-8=0 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 2x+3y-1=y-x-8=x+6 ,y=? 已知方程组2X+Y=6和X-3Y=1不解方程组,求7Y(X-3Y)^2-(3Y-X)^3 三个方程组,①x-y=3 ②2（x-y+1）=4（x+y）-6 3x-8y=14 x/2+y/4=-3③3（x+y）+2（x-y）=362(x+y)-3(x-y)=24每个方程组都需要过程和结果（只是结果也行） (x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3 用加减法解下列方程组 2x+5y=12和2x+3y=6 5x-5y=33和15x+5y=7 2x+y=9和x+3y=11 x-2y=-1和3x+5y=8直接答案我不懂