3x+2y=8和6x-5y=47,

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

【2(x-y)^3-8(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)^3-8(

四个二元一次方程组3x+2y=8和6x-5y=-47,3x+2y=6和5x-2y=64,3x+4y=11和4x-5y=-37,2x-5y=24和5x+2y=31的解四个二元一次方程组3x+2y=8和6

x+y/2+x-y/6=52(x+y)-3(x-y)=-2x+y/2+x-y/6=52(x+y)-3(x-y)=-2x+y/2+x-y/6=52(x+y)-3(x-y)=-2由式（1）获得3X+3γ-

6(x-y)-2(x+y)=143(x-y)+(x+y)=56(x-y)-2(x+y)=143(x-y)+(x+y)=56(x-y)-2(x+y)=143(x-y)+(x+y)=5设x-y=mx+y=

5X+Y=3X+5Y=2求x和y.5X+Y=3X+5Y=2求x和y.5X+Y=3X+5Y=2求x和y.5X+Y=3X+5Y=2求x和y.5X+Y=3X+5Y=2求x和y.5X+Y=3X+5Y=2求x和

已知3X+8y=10,5X+2y=6求X和Y的值,已知3X+8y=10,5X+2y=6求X和Y的值,已知3X+8y=10,5X+2y=6求X和Y的值,5x+2y=6同时乘420x-8y=24用第一个式

{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+

求解简单的二元一次方程组x=3y-2和y=2x-y2x=3y-12和4y=2x+13x-13y=-12和x+3y=22x-5y+13=0和9x+6y-8=0求解简单的二元一次方程组x=3y-2和y=2

3(2X+Y)+(2(2x-Y)=6(8X+4y)-(10X-5Y)=23(2X+Y)+(2(2x-Y)=6(8X+4y)-(10X-5Y)=23(2X+Y)+(2(2x-Y)=6(8X+4y)-(1

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)已知x-y/x+y=3,求代数式5(x-y)/x+y

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)^2X^2Y+XY^2注：*/*是分数已知X,Y,满足(X+3Y)(X-3Y)=-1

{6x+5y=8,3x=2y-5x=y={6x+5y=8,3x=2y-5x=y={6x+5y=8,3x=2y-5x=y=右式乘以2得,6x=4y-10,代入左式中,得4y-10+5y=89y=18y=

6x-2y=58x-3y=-5求x,y6x-2y=58x-3y=-5求x,y6x-2y=58x-3y=-5求x,yx=25/2,y=35

(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题(x-2

已知(x+y):y=8:3,求2x+5y/3x-y和x^2-xy/y^2+3xy的值已知(x+y):y=8:3,求2x+5y/3x-y和x^2-xy/y^2+3xy的值已知(x+y):y=8:3,求2

若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)若X:Y:Z=5:6

3x+2y=53y+2x=5求x和y3x+2y=53y+2x=5求x和y3x+2y=53y+2x=5求x和y 

已知7Y=X-3,8Y=X+5求X和Y已知7Y=X-3,8Y=X+5求X和Y已知7Y=X-3,8Y=X+5求X和Y7Y=X-3（1）8Y=X+5（2）（2）-（1）得：Y=8代入（1）算得：X=59两

x\2+y\3=-3,7x=8y-4求x和yx\2+y\3=-3,7x=8y-4求x和yx\2+y\3=-3,7x=8y-4求x和yx\2+y\3=-3,两边同乘以2412x+8y=-72①7x=8y