(x-3)/2+(y-2)/3=8 (x-3)/2-(y-2)/3=2 解二元一次方程 用加减法做 在线等 另给10分!x-3)(/2+(y-2)/3=8 (x-3)/2-(y-2)/3=2 解二元一次方程 用加减法做 写具体过程 在线等 另给10分!
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(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
2(x-y)²-3(x-y)(-y-x)
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
3x+y=2 -y/x+y=123x+y=2 (-y/x)+y=12
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2)/2(x-y)^2
1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/(x^2-5x+6)+(x^2-3x+8)/(x^2-4x+3)2.{(x^2)/(x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{(x^2/x^2+y^2)^2}
[(x-y)²+(x+y)(x-y)]/2xx=3,y=-1.5
(-7x^2-8y^2)*(-x^2+3y^2) (3x-2y)(y-3x)-(2x-y)(3x+y)
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
{2x的平方-(x+y)(x-y)}{(-x-y)(y-x)+2y的平方}x=根号2,y=根号3
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
x+y分之x-y=-2,求3(x+y)分之x-y减去x-y分之2(x+y)的值
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=