y=5-|2x-1|

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{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1

{6(x-y)-7(x+y)=21{2(x-y)-5(x+y)=-1{6(x-y)-7(x+y)=21{2(x-y)-5(x+y)=-1{6(x-y)-7(x+y)=21{2(x-y)-5(x+y)=

(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)

(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(

3x(2x+y)-2x(x-y),其中x=1,y=1/5

3x(2x+y)-2x(x-y),其中x=1,y=1/53x(2x+y)-2x(x-y),其中x=1,y=1/53x(2x+y)-2x(x-y),其中x=1,y=1/5算术题?结果5

{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?

{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?{(x+y)/2+(x-y)/3

解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=-4

解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=-4解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=-4解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=-4x

(x-4y)(x-y)-(x+3y)(x-6y)-5x(2-y),其中x=﹣1/3,y=1/2(x&

(x-4y)(x-y)-(x+3y)(x-6y)-5x(2-y),其中x=﹣1/3,y=1/2(x²-nx+3)(x²+3x+m)的展开式中不含x²和x³项,求

当x=﹣1,y=﹣2时,求代数式[﹙x+2y﹚²-(x+y)(5x-y)-5y²

当x=﹣1,y=﹣2时,求代数式[﹙x+2y﹚²-(x+y)(5x-y)-5y²]÷﹙2x﹚十万火急,求大师解答,求过程啊当x=﹣1,y=﹣2时,求代数式[﹙x+2y﹚²

x+2y=9 3x-2y=-1 5x+2y=25 3x+4y=15 2x+3y=x+2y=9 3x-

x+2y=93x-2y=-15x+2y=253x+4y=152x+3y=x+2y=93x-2y=-15x+2y=253x+4y=152x+3y=63x-2y=-2x+2y=93x-2y=-1解二元一次

(2x+y-5)(2x-y+5)(2x+3y)的平方-(2x+y)(2x-y) 其中x=1 y=21

(2x+y-5)(2x-y+5)(2x+3y)的平方-(2x+y)(2x-y)其中x=1y=21-x的平方+2xy+y的平方(a的平方+4)的平方-16a的平方3ax的平方-12ay的平方(2x+y-

1.设A={(x,y)|2x-y=1},B={(x,y)|5x+y=6},C={(x,y)|2x=y

1.设A={(x,y)|2x-y=1},B={(x,y)|5x+y=6},C={(x,y)|2x=y+1},D={(x,y)|2x-y=8}则A∩B=,B∩C=,A∩D=.2.设A={x|-5<x<2

(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1

(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1y=13分之1(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1y=13分之1(x

x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x

x+y=15x-2y=83x-y=72x-y=3x表示y和用y表示xx+y=15x-2y=83x-y=72x-y=3x表示y和用y表示xx+y=15x-2y=83x-y=72x-y=3x表示y和用y表

解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1

解方程组2x-y=52y/x-x/y=12x-y=52y/x-x/y=1解方程组2x-y=52y/x-x/y=12x-y=52y/x-x/y=1解方程组2x-y=52y/x-x/y=12x-y=52y

(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,

(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,(2x+y-1)(2x-y+1)-(3x+y

(1)5/x+y - 2/x-y=42/x+y - 3/x-y=-5(2)3x+2y+z=13x+y

(1)5/x+y-2/x-y=42/x+y-3/x-y=-5(2)3x+2y+z=13x+y+2z=72x+3y-z=12(3)2x+4y+3z=93x-2y+5z=115x+6y+8z=0(4)2x

已知x^2+y^2+5=2x+4y,求代数式[2x^2-(x+y)(x-y)][(x+y-1)(x-

已知x^2+y^2+5=2x+4y,求代数式[2x^2-(x+y)(x-y)][(x+y-1)(x-y-1)+1-2y]的值.会给好评哦已知x^2+y^2+5=2x+4y,求代数式[2x^2-(x+y

已知x^2+y^2+5=2x+4y,求代数式[2x^2-(x+y)(x-y)][(x+y-1)(x-

已知x^2+y^2+5=2x+4y,求代数式[2x^2-(x+y)(x-y)][(x+y-1)(x-y+1)+1-2y]的值.已知x^2+y^2+5=2x+4y,求代数式[2x^2-(x+y)(x-y

x+2y=9 3x-2y=-1 5x+2y=25 3x+4y=15 2x+3y=x+2y=9

x+2y=93x-2y=-15x+2y=253x+4y=152x+3y=x+2y=93x-2y=-15x+2y=253x+4y=152x+3y=63x-2y=-2x+2y=93x-2y=-1解二元一次

{5x+2y=18,y=-x

{5x+2y=18,y=-x{5x+2y=18,y=-x{5x+2y=18,y=-xx=6y=-6把2式代入1式得5x+2(-x)=183x=18x=6把x=6代入2式y=-6求,给个最佳咯.x=6y

方程组:x(y+1)+2(y+1)=y(y-1)x-5(y-1) x(4+y)-y(8-x)=-20

方程组:x(y+1)+2(y+1)=y(y-1)x-5(y-1)x(4+y)-y(8-x)=-20x(y+1)+2(y+1)=y(y-1)x-5(y-1)x(4+y)-y(8-x)=-20(这是一个方