用消元法求2x+3y=0、3x+5y=—1(急,
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用消元法求2x+3y=0、3x+5y=—1(急,
用消元法求2x+3y=0、3x+5y=—1(急,
用消元法求2x+3y=0、3x+5y=—1(急,
2x+3y=0,则x=-3/2y 代入3x+5y=—1,得
-9/2y+5y=-1
1/2y=-1
则y=-2
则x=-3/2y=3
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
先化简,再求值:[3x-2/x+y(x+y/3x-x-y)]/(x-y/x),其中5x+3y=0
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
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
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
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 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
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?