{6/x+y+10/x-y=30 6/x+y-10/x-y=-1

用加减法解方程组:{(x+y)/6+(x-y)/10=3 (x+y)/6+(y-x)/10=-1 解方程组x+y/6+x-y/10=3,x+y/6+y-x/10=-1 2x+y=4x-y-1/2=10+6x+2y/4 ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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=6 10x+y≤42 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16 已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x. 已知x^2+y^2--6x--2y+10=0,求x+y/x--y