x=0,1,2,3,4,5 y=0,1,4,13,40,121 求y=?
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
x^2+y^2-4x-6y+13=0,求(2/3根号9x+y^2根号x/y^3)-x^2根号1/x-5x根号y/x)的值
已知 (2x+3y-4)²+|x+3y+1|=0 求3x+5y的值
若2x-3y=0,求5x+4y/3x-2y
已知x,y>0 2x+y+3=xy 求5x+4y最小值
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
己知x平方+3xy一4y平方=0(y≠0)求代数式(1)y分之x(2)x+y分之x一y
已知实数x,y满足5x^2-3xy+1\2y^2-2x+1\2y+1\4=0,求x,y的值
已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值
已知(3X-2)的平方+|2X-Y|=0,求5(2X-Y)-2(6X-2Y+2)+(4-3Y-1/2)