方程1:(x+y)²=2x(x+2y+1)
已知实数x、y满足方程x^2+y^2-4x+1=0
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
已知实数x、y,满足方程x²+y²-4x+1=0,求:(1)y÷x的最大 值和最小值;(2)y-x
计算:[(x+¼y)+(x-¼y)](2x²-1/8y²)
{(x-y)²+(x+y)(x-y)}÷2x
解方程 1.y=3x+2 y+3x=8 2.2x=3y 4x-3y=4 3.3x+2y=3 2y=3x-1
1、x(x-y)(x+y)-x(x+y)^2
求与圆C:x^2+y^2-x+2y=0关于直线l:x-y+1=0对称的圆的方程
求齐次方程y(x^2-xy+y^2)dx+x(x^2-xy+y^2)dy=0.
求齐次方程y(x^2-xy+y^2)dx+x(x^2-xy+y^2)dy=0
1、已知实数x、x满足x²+y²-xy+2x-y+1=0,试求x、y的值.