3x-4y+11=0[1] 3y-4x+53=0[2]
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
(3x-2)²+2x-y-3的绝对值=0,求5(2x-y)-2(6x-2y+2)+(4x-3y-2分之1)
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
解方程 : 配方法:2X的平方+7x+6=0 6y-19根号3y+45=0 公式法:3y的平方-2y=2y+3 (x+4
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
4x-3y-6z=0,x+2y-7z=0,xyz的积不等于0,求(x+y-z)/(x-y+2z)的值
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
已知2x-y/x+3y=2,求代数式﹙4x-2y/x+3y﹚-﹙4x+12y/2x-y﹚的值