y=8-2x 5x-y=-1
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y=8-2x5x-y=-1y=8-2x5x-y=-1y=8-2x5x-y=-1x=1,y=6
y=8-2x 5x-y=-1
y=8-2x 5x-y=-1
y=8-2x 5x-y=-1
x=1,y=6
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
{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
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{x+y=5 2x-1y=8
y=8-2x 5x-y=-1
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x+y=8 2x-y=1 求3x+5y
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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(这是一个方程组.)
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先化简,再求值[(2x+y)^2-(2x+y)(2x-y)-y(5x+y)]÷(1/2y),其中x-y=2