2x-3y=1;2x^2-3xy+y^2-4x+3y-3=0;禁止第一步就用换元法!
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2x-3y=1;2x^2-3xy+y^2-4x+3y-3=0;禁止第一步就用换元法!
2x-3y=1;2x^2-3xy+y^2-4x+3y-3=0;
禁止第一步就用换元法!
2x-3y=1;2x^2-3xy+y^2-4x+3y-3=0;禁止第一步就用换元法!
2x^2-3xy+y^2-4x+3y-3=0
(2x-3y)x+y^2-2x-(2x-3y)-3=0
x+y^2-2x-1-3=0
y^2-x-4=0①
2x-3y=1
x=(1+3y)/2②
②代入①
y^2-(1+3y)/2-4=0
2y^2-1-3y-8=0
2y^2-3y-9=0
(y-3)(2y+3)=0
y1=3,y2=-3/2代入②得:
当y1=3时,x1=5
当y2=-3/2时,x2=-7/4
若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思,是3x-2xy-3y/x-2xy-y
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出,
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
化简求值x-4y/2x-7xy+3y×x-2xy-3y/2x+3xy-2y÷3x-6y/4x-4xy+y,其中:x=1999,y=-1
(-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解
x+y=-3 xy+x+y=-2 x/y+y/x=?
因式分解x^2y^2+x^2y+xy^2+3xy+x+y+1
f(xy,x-y)=x^2+3xy+y^2,则f(x,y)=?