已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知,xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+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x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知xy不等于0,且3x² -2xy-8y²=0,求x/y的值
已知xy≠0,且3x²-2xy-8y²=0,求x/y+y/x的值
已知x²-10x+25+|y-3|=0,求2xy+xy分之x²+x的值
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
已知2x²-3xy-20y²=0,且y≠0,求y分之x的值.
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
1.已知x-3y=0,且xy≠0,求x²-y²/x²-xy+y²的值.