已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x
已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知X²+Y²=7,XY=-2,求代数式5X²-3XY-4Y²-11XY-7X&
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知x²+y²=7,xy=-2.那么5x²-3xy-4y²-11xy-7x
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x²+y²=9,xy=-3,求多项式5x²-3xy-5y²-11xy-8x&
1.已知x²+y²+7 xy+-2求5x²-3xy-4y²-11xy-7x
已知x-2y=3,x²-2xy+4y²=11,求下列各值; (1)xy (2)x²-2xy
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值