xy=11,x=2+y,y=x-2,把XY解出来
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xy=11,x=2+y,y=x-2,把XY解出来xy=11,x=2+y,y=x-2,把XY解出来xy=11,x=2+y,y=x-2,把XY解出来x(x-2)=11x²-2x=11x²
xy=11,x=2+y,y=x-2,把XY解出来
xy=11,x=2+y,y=x-2,把XY解出来
xy=11,x=2+y,y=x-2,把XY解出来
x(x-2)=11
x²-2x=11
x²-2x+1=12
(x-1)²=12
x-1=√12或x-1=-√12
x=1+2√3或x=1-2√3
y=x-2
y=-1+2√3或x=-3-2√3
x=2+y,xy=11
(2+y)y=11
y^2+2y-11=0
y=-1+2根号3 x=1+2根号3
y=-1-2根号3 x=1-2根号3
y=x-2
x(x-2)=11
x^2-2x-11=0
x=(2±根号(4+44) )/2=1±2根号3
y=±2根号3-1
x1=4根号3 x2=-4根号3
y就是x-2
xy=11,x=2+y,y=x-2,把XY解出来
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