已知(x+y)²=25,xy=6,求x-y的值.
已知(x+y)²=25,xy=6,求x-y的值.
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
已知,x-y=5,xy=6,求(x+y)²-2x-2y+1的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值