8X-8Y=240 5X-3Y=270怎样解
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(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
(x+y)/y=8/3则x/y=__ y/x-y=___
(x+y)/y=8/3则x/y=__ y/x-y=___
12y(x-y)^2-8(x-y)^3=?
{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+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
7y=x+3,8y=x+5
7y=x+3,8y-5=x
7y=x+3,8y+5=x
x+y=8,5x+3y=34;
(7y-3x)-(8y-5x)=
5X+8Y=3Y+6X
x+y=5,2x+y=8,x-2y=0,3x+2y=8