已知2x²-3xy-2y²=0,求(x+y)/(x-y)的值
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/13 08:33:15
已知2x²-3xy-2y²=0,求(x+y)/(x-y)的值
在练习册用配方法解一元二次方程那个课时出现的
在练习册用配方法解一元二次方程那个课时出现的
2x²-3xy-2y²=0
(2x+y)(x-2y)=0
x=2y,或x=-y/2
所以
(x+y)/(x-y)
=(2y+y)/(2y-y)
=3
或=(-y/2+y)/(-y/2-2y)
=(y/2)/(-5y/2)
=-1/5
(2x+y)(x-2y)=0
x=2y,或x=-y/2
所以
(x+y)/(x-y)
=(2y+y)/(2y-y)
=3
或=(-y/2+y)/(-y/2-2y)
=(y/2)/(-5y/2)
=-1/5
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知x^2+xy-2y^2=0 (x不等于0,y不等于0),求x/y-y/x-(x^2+y^2)/xy的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值