x
∵x-3y=0,即x=3y, ∴原式= 9y2−y2 9y2−3y2+y2= 8 7.
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值
已知xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知,xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值
(1)已知x-y=6,xy=4,求xy^-1+x^-1y的值; (2)已知x^2+y^2=3xy且xy≠0,求x^2y^
已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知|x|=2,|y|=3,且xy大于0,求x+y的值
1.已知x-3y=0,且xy≠0,求x²-y²/x²-xy+y²的值.
已知xy≠0,且3x²-2xy-8y²=0,求x/y+y/x的值
已知x²+y²=3xy且xy≠0,求x²y-²+x-²y²的
已知x+y=3xy且xy≠0,求xy的负二次方+x的负二次方y的值
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