已知x+y=7,xy=6,求x-y 的值
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知X+Y=6,xy=3求代数式(5XY+4X+7Y)+(6X-3XY)-(4XY-3Y)的值
已知x+y=3,xy=1,求代数式5xy+4x+7y+6x-3xy-4xy+3y的值.
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知(X-Y)^2=625/36,X+Y=7/6,求XY的值
已知x+y=6,xy=7,求(3x+y)*(3x+y)+(x+3y)*(x+3y)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xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x/y=2,求 [x^2-xy+3xy^2 ] / [ x^2+xy+6y^2]的值