已知x/y=2/7,则 x^2-3xy+2y^2/2x^2-3xy+7y^2
来源:学生作业帮助网 编辑:六六作业网 时间:2024/08/29 04:01:55
已知x/y=2/7,则x^2-3xy+2y^2/2x^2-3xy+7y^2已知x/y=2/7,则x^2-3xy+2y^2/2x^2-3xy+7y^2已知x/y=2/7,则x^2-3xy+2y^2/2x
已知x/y=2/7,则 x^2-3xy+2y^2/2x^2-3xy+7y^2
已知x/y=2/7,则 x^2-3xy+2y^2/2x^2-3xy+7y^2
已知x/y=2/7,则 x^2-3xy+2y^2/2x^2-3xy+7y^2
令x=2k y=7k
代入
x^2-3xy+2y^2/2x^2-3xy+7y^2
=4k^2-42k^2+98k^2/(8k^2-42k^2+343k^2)
=20/103
令x=2k yx^2-3xy+2y^2/2x^2-3xy+7y^2
=4k^2-42k^2+98k^2/(8k^2-42k^2+343k^2)
=20/103
=7k
已知xy/x+y=3,则代数式2x-7xy+2y/-x+xy-y的值是多少?
已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=?
已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)=
已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?
已知x-y=3xy,则2x+3xy-2y/x-2xy-y=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知xy^2=-2求xy(2x^3y^7+5x^2y
已知x/y=3/4 ,则3xy-2y/2x+4xy=?
已知x+y=6,xy=-3,则x^2y+xy^2=?
已知x+y=2,xy=3,则x²+y²-3xy=?
已知x+y=5,xy=-3,则x^2y+xy^2,
已知x+y=6,xy=-3,则x∧y+xy∧2=
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²)的值为
已知x^2-3xy+2y^2=0 则x/y+x/y=
已知(x+y)/(x-y)=3/2,则(x²+y²)/xy =