5y=5x-10,求y...
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知:4x = 5y,求(x+y) :y
求y''-2y'+5y=(e^x)sin2x
已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
y=x^5+ln^3x 求y'
求不等式{(x-y+5)(x+y)>=0,0
求dy/dx=(x-y+5)/(x+y-2)
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*