已知x分之一减去y分之一等于5,求分式x-3xy-y分之3x+5xy-3y的值
(x-3xy-y)\/(3x+5xy-3y)分式上下同时除以 xy =(1\/y-3-1\/x)\/(3\/y+5-3\/x)=(-5-3)\/(-5*3+5)=-8\/(-10)=4\/5 =0.8
已知1\/x-1\/y=5,求分式3x+5xy-3y\/x-3xy-y的值
解:1\/x-1\/y=5 (x-y)\/xy=-5 x-y=-5xy 带入后式 原式=【3(x-y)+5xy】\/【(x-y)-3xy】=(-10xy)\/(-8xy)=5\/4
已知1\/x-1\/y=5,求分式(3x+5xy-3y)\/(y-xy-x)的值
1\/x-1\/y=5, y-x=5xy (3x+5xy-3y)\/(y-xy-x) =(-15xy+5xy)\/(5xy-xy) =-5\/2
1、当1\/x-1\/y=5时,求分式(3x+5xy-3y)÷(x-3xy-y)的值.
(3x+5xy-3y)÷(x-3xy-y)=(-15xy+5xy)\/(-5xy-3xy)=-10xy\/(-8xy)=5\/4
已知x分之一减y分之一等于5
1、(3x+5xy-3y)\/(x-3xy-y)=(3\/y+5-3\/x)\/(1\/y-3-1\/x)(分子分母同除以xy)=(5-5*3)\/(-3-5)=5\/4 2、分式x平方+x平方分之一=(x^2+2+1\/x^2)-2=(x+1\/x)^2-2=3^2-2=7
已知1\/x-1\/y=5求3x+5xy-3y\/x+2xy-y
首先化简通分1\/x+1\/y=5得: (x+y)\/xy=5 即有x+y=5xy 将要求的分式化简: 3x+xy+3y\/x-2xy+y =3x+3y+xy\/x+y-2xy (根据加法交换律) =3(x+y)+xy\/(x+y)-2xy =15xy+xy\/5xy-2xy(将x+y=5xy代入) =16xy\/3xy =16\/3 ...
已知1\/x减1\/y=3,求5x+3xy-5y\/x-xy-y的值
(5x+3xy-5y)\/(x-xy-y) 分子分母同时除以xy得 =(5\/y+3-5\/x)\/(1\/y-1-1\/x)=[-5(1\/x-1\/y)+3]\/[-(1\/x-1\/y)-1]=(-5×3+3)\/(-3-1)=(-12)\/(-4)=3
分式方程的应用 跪求 各位高高手帮帮忙 要详细的解题过程和答案 题目我...
分式:1、当1\/x-1\/y=5时,求分式(3x+5xy-3y)÷(x-3xy-y)的值。答案:5\/4 2、已知a+b+c=0,求a(1\/b+1\/c)+b(1\/c+1\/a)+c(1\/a+1\/b)的值。答案:-3 3、解方程:(x-8)\/(x-3)-(x-9)\/(x-4)=(x+7)\/(x+8)-(x+2)\/(x+3)答案:x=-2\/3 4、当a为何...
已知:x分之一减y分之一等于5,求x-2xy-2y分之2x+3xy-2y的值
解:1\/x - 1\/y = 5.通分整理得,(y - x )\/xy =5 即y - x = 5xy 然后把后边的分式分子分母中整理,比如 分子2x +3xy - 2y就整理成2(x - y)+3xy 代换成 2.(-5xy)+3xy =-7xy ,分母也这样整理。最后分子分母约分可得结果。我只告诉你算理。不过看样子你这题应该是题目抄写...
已知x分之一减y分之一等于五,求分式2x+7xy—2y分之-x+xy+y的值?
1\/X-1\/Y=5,去分母得:Y-X=5XY,2x+7xy—2y分之-x+xy+y =[(y-x)+xy]\/[-2(y-x)+7xy]=6xy\/(-3xy)=-2.,9,