x^3/y -x^5/y^2 x^7/y^3 -x^9/y^4 (xy不等于0)问第n个式子是 ?
一组按规律排列的式子:x^3/y,-x^5/y^2,x^7/y^3,-x^9/y^4,……(xy≠0),其中第n个式子是
给定一列分式,y/x^3,-y^2/x^5,y^3/x^7,-y^4/x^9,.(其中xy不等于0),试写出给定分式中第
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知xy互为相反数,求式子3x-10+3y+Y分之5x y不等于0
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
已知x-y不等于0,x^2-x=7,y^2-y=7,求x^3+y^3+x^2y+xy^2的值
已知x,y互为相反数,求式子3x-10+3y+5x/y(y不等于0)
观察下列一串单项式的特点:xy,-2x^2y,4x^3y,-8x^4y,16x^5y,-32x ^6y,第n个单项式为多
问一道数学题 已知xy=-2,x+y=3,求式子(3xy+10y+[+5x-(2xy+2y-3x)] 怎么写啊
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
给定下面一列分式:X^3/Y ,-X^5/Y^2 ,X^7/Y^3,-x^9/Y^4,...(其中X不等于0)