已知3x-2y=6,2x-3y=17,6x^2-13xy+6y^2-24x+11y-90=?
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知3x-2y=6,2x-3y=17,6x^2-13xy+6y^2-24x+11y-90=?
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
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x^2-2xy-3y^2/x^-6xy
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xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知;x+y=4,x-y的绝对值=6,求xy(y的平方+y)-y的平方(xy+2x)-3xy
已知x/y=2,求(x^2-xy+3y^2)/(x^2+xy+6y^2)的值
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值