1.(3x+2y)/4=(2x+5)/5(3x+2y)/4=(x-y+1)/62.X=(2y+4)/3Y=(3x-4)/3
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1.(3x+2y)/4=(2x+5)/5(3x+2y)/4=(x-y+1)/62.X=(2y+4)/3Y=(3x-4)/31.(3x+2y)/4=(2x+5)/5(3x+2y)/4=(x-y+1)/6
1.(3x+2y)/4=(2x+5)/5(3x+2y)/4=(x-y+1)/62.X=(2y+4)/3Y=(3x-4)/3
1.(3x+2y)/4=(2x+5)/5
(3x+2y)/4=(x-y+1)/6
2.X=(2y+4)/3
Y=(3x-4)/3
1.(3x+2y)/4=(2x+5)/5(3x+2y)/4=(x-y+1)/62.X=(2y+4)/3Y=(3x-4)/3
1..(3x+2y)/4=(2x+5)/5
5(3x+2y)=4(2x+5)
15x+10y=8x+20
7x+10y=20
(3x+2y)/4=(x-y+1)/6
9x+6y=2x-2y+2
7x+8y=2
由以上得y=9 x=-10
2. X=(2y+4)/3
3x-2y=4
Y=(3x-4)/3
-3x+3y=-4
由以上得y=0 x=4/3
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
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3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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}
1.解方程组{x+y=7,3x+y=172.{x+y=4,2x-y=53.{3x+2y=5x+2,2(3x+2y)=2x+8
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
计算:1.y/4x²-1/12y²+1/6xy 2.3/x-6/1-x-x+5/x²-x3.x/x-y×y²/x+y-x四次方y/x四次方-y四次方÷x²/x²+y²解方程:1.x-1/(x-2)+1=1/2-x2.x+1/x-1-4/x²-1=13.1/x+3-2/3-x=1/x²-9
{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
5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^2]
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算