已知2x²+5xy-3y²=0且xy≠0,求(2x+3)÷(2x-3y)
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知x²-xy-y²=0,且x≠0,y≠0.求代数式(x²-2xy-5y²)/(
已知xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知2x²-3y²=xy,(xy≠0),求值(4xy-x²)/(xy+2y²)的
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知x²+y²=3xy且xy≠0,求x²y-²+x-²y²的
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知3x+2y=0,求代数式(x²+xy-y²)÷(x²-xy+y²)的值.
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
分式 已知y-2x=0(x≠0且y≠0),求代数式(x²-y²)(x²-xy+y²