2/(x+y)+5/(x-y)=-8,9/(x+y)-10/(x-y)=-11 他舅近来帮忙下
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3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
5x=3y,(2x+y)的平方=5x(x+y)+9
9y=3x-(x-1),4(x+y)-(2x+4)=8y
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-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
(2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)