5x+10y=75 8x+6-5y=0 x=? y=?

X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=? 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 （5x-6y)(x+y)=0(x不等于y),则y/x= 5x+10y=75 8x+6-5y=0 x=? y=? {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 3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2 已知|5x-y-8|+(7y-x+2)=0则4x+6y (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 x1:4x-3y=8;y=7-5x;2:2x-7y=8,3x-8y-10=0;3:4x-y=-1;4:5x-10y+15=0;5:2x-4y=6,3x+2y=27;6:3y=x+5,2x+5y=231：2x+3y=7,3x-5y=1;2:3x+5y=5,3x-4y=23;3:3x+5y=5,3x-4y=23;4:5x+y=7,3x-y=1;5:4x-3y=5,4x+6y=14;6:6x+7y=5,6x-7y=19;7:0.5x-3y=-1,-二分之一x+5y=3 代入法解方程组(1)2y-8=-x (2)x-y=5 (3)2x+3y=7 (4)y=x+1 4x+3y=10 4x+3y=7 3x-6y=0 3x+4y=11 (5)y=x+1 3x+4y=11(6) x-5y=03x+2y=17记得详细一点.. 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 第一题：2X+Y-11=0 ,X+3Y-18=0第二题：2X+5Y-6=0 ,2X-5Y-6=0第三题：2X+Y-8=0 ,X-2Y+1=0第四题：2X-3Y+10=0 ,3X+4Y-2=0分别求出X,Y. 若｜y+5｜+(5x+1)2=0,求-3(2x-y)-｛7x-[6x+2y-(10x-8y)]-x-2(3x-4y)｝的值 若|y+5|+(5x+1)^2=0,求代数式-3(2x-y)-{7x-[6x+2y-(10x-8y)]-x-2(3x-4y)}的值