若分式1 x-1 y=2则分式4x 5xy-4y x-3xy-y的值等于
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x,y均不等于0,分式上下同时除以xy,得:((2/y)+3-(2/x))/((1/y)-2-(1/x))=-3/-5=3/5
1)由1/x-1/y=5,得(y-x)/xy=5,所以y-x=5xy,即x-y=-5xy(3x+5xy-3y)/(x-3xy-y)=[3(x-y)+5xy]/[(x-y)-3xy]=(-15xy+5x
1/x-1/y=3(y-x)/xy=3y-x=3xy(4x-5xy-4y)/(3x-2xy-3y)=(4(x-y)-5xy)/(3(x-y)-2xy)=(4*-3xy-5xy)/(3*-3xy-2xy
定义:整式A除以整式B,可以表示成A/B的形式.如果除式B中含有字母,那么称为分式(fraction).是分式
1;=3(x+y)/(x-y)2:x平方/(2x-1-x+1)=x3:=-(2x平方-2x-1)/(3x+1)
解法一:1)因(1/x)-(1/y)=3,可得:(y-x)/xy=3,得:x+3xy-y=0.2)2x+3xy-2y)/(x-2xy-y)可以进一步分解成:{x+(x+3xy-y)-Y}/{(x+3x
原式=x−yxy=1.故选C.
它们的最最公分母是x²y²1/x²y=y/x²y²1/xy²=x/x²y²再问:当x=()时,分式2x-4分之3的值为负
(x²-4)/(xy-x+2y-2)=[(x+2)(x-2)]/[y(x+2)-(x+2)]=[(x+2)(x-2)]/[(x+2)(y-1)]=(x-2)/(y-1)=(-8-2)/(1/
方程两边同乘(x+1)(x+2)(x+3)(x+4),得(x+3)(x+4)+(x+1)(x+4)+(x+1)(x+2)=(x+1)(x+2)(x+3),∴3x2+15x+18=(x+1)(x+2)(
1/x-1/y=5即,(y-x)/xy=5即,x-y=-5xy(3x-2xy-3y)/(x+xy-y)=[3(x-y)-2xy]/[(x-y)+xy]=(-15xy-2xy)/(-5xy+xy)=(-
应该是(x+y)/(x^2-y^2)这样的吧也就是1/(x-y)那么1/3(x-y)=1/3所以x-y=1
1/x-1/y=2010等式两边同乘xy得y-x=2010xy即x-y=-2010xy,代入分式中,原式=(-2010xy+2xy)/(-2010xy)=1004/1005
∵x2-3x=x(x-3),x2-9=(x+3)(x-3)∴他们的最简公分母为:x(x+3)(x-3).
2xy/x+y2x.2y/2x+2y=4xy/2*(x+y)=2xy/x+y不知道对不对
4x/2x-1=2x-1/x-2(2x-1)*(2x-1)=4x*(x-2)x=-1/4