1.已知x+y=5,xy=2,则x^4 y^3+x^3 y^4 2.因式分解0.25X²-0.01y²
1.已知x+y=5,xy=2,则x^4 y^3+x^3 y^4 2.因式分解0.25X²-0.01y²
已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+
1.已知3x²-xy+y²=10,-xy+4y²=4,则x²-y²的值
急求三道八上数学题1.已知x+y=0,x+3y=1,求3x²+12xy+13y²的值2.因式分解:4
因式分解:3x²+5xy-2y²+x+9y-4
1.已知x/y=3/4,求(7x²-3xy+2y²)/(2x²-3xy+7y²)
已知x/3y=y/2x-5y=6x-5y/x,则4x²-5xy+6y²/x²-2xy+3y
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
问已知x²+y²=7,xy=-2,求5x²-3xy-4y²-11xy-7x&su
已知x-2y=3,x²-2xy+4y²=11,求①xy ②x²y-2xy²
因式分解 x²-3xy+2y²+x-2