已知xy²=-6,求-xy(x³y∧7-3x²y∧5-5y))
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知实数x,y,xy=5,x+y=7,求代数式x²y+xy²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x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
已知x-y=根号5,xy=二分之一,求x²-xy+y²
已知xy^2=-2求xy(2x^3y^7+5x^2y
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
1.已知x²+y²+7 xy+-2求5x²-3xy-4y²-11xy-7x
已知X²+Y²=7,XY=-2,求代数式5X²-3XY-4Y²-11XY-7X&