X+Y=960,1.3X+1.25Y=1228,求XY
X+Y=960,1.3X+1.25Y=1228,求XY
x^2+xy+x=36,y^2+xy+y=20,求x+y.
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
xy=2010,x+y=2009,求x,y
y'+xy=x^3求微分
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
x,y都是自然数,且x(x-y)-y(y-x)=12,求x+y-xy的值