1.4x-3y=6 2/y=12 2.y/5+x=4 3.xy-9y=4 3x+6y=4 4.x+y=9 x²
1.4x-3y=6 2/y=12 2.y/5+x=4 3.xy-9y=4 3x+6y=4 4.x+y=9 x²
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
x*-2xy+3y*=9 4x*-5xy+6y*=30
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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
已知:x²-6xy+9y²=0,求代数式3x+5y/4x²-y²×(2x+y)的
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}