4x^2+9y^2-4x-6y+2=0,求1/√xy
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4x^2+9y^2-4x-6y+2=0,求1/√xy4x^2+9y^2-4x-6y+2=0,求1/√xy4x^2+9y^2-4x-6y+2=0,求1/√xy4x^2+9y^2-4x-6y+2=0(4x
4x^2+9y^2-4x-6y+2=0,求1/√xy
4x^2+9y^2-4x-6y+2=0,求1/√xy
4x^2+9y^2-4x-6y+2=0,求1/√xy
4x^2+9y^2-4x-6y+2=0
(4x²-4x+1)+(9y²-6y+1)=0
(2x-1)²+(3y-1)²=0
∴x=1/2 y=1/3
1/√xy=√6
常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x)
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(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x*x+2x+y*y-4y+5=0 x= y=
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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