(-3xy)除以3x分之2y的平方
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由X+Y=3XY可得X+Y-XY=2XY,用X+Y-XY替换分母中的2XY,所以(2X+2Y-XY)/(X+Y+2XY)=(2X+2Y-XY)/(2X+2Y-XY)=1
(xy分之X的平方-Y的平方)的平方除以【(X+Y)*(X分之X-Y)的3次方]除以y的平方分之x=[(x^2-y^2)^2/x^2y^2]÷[x^2-y^2)(x-y)^2/x]^3÷(x/y^2)
x-3y=0x=3y(2x+y)/(x^2-2xy+y^2)÷1/(x-y)=(2x+y)/(x-y)^2÷1/(x-y)=(2x+y)/(x-y)^2*(x-y)=(2x+y)/(x-y)=(2*3
3x^2+xy-2y^2=(3x-2y)(x+y)=0x=-2y/3,或x=-y但由于你要求的式子中分母里有X平方-Y平方x=-y舍去其他就代入吧
3x^2+xy-2y^2=0(3x-2y)(x+y)=0x=2/3y或x=y(舍去)X-Y分之X+YX-Y不等于0题目太乱了,剩下的自己代进去算吧!
1/x+1/y=2(x+y)/xy=2x+y=2xy(2x-xy+2y)/(3x+5xy+3y)=[2(x+y)-xy]/[3(x+y)+5xy]=(4xy-xy)/(6xy+5xy)=3xy/11x
解题有点难写,你找我上Q吧,我语聊告诉你,1256769059
分式的计算1.3a除以4b乘以16b除以9a的平方=(3a/4b)*(16b/9a^2)=4/3a2.12xy除以5a除以8x的平方y=(12xy/5a)/8x^2y=3/10ax3.-3xy除以3x
(xy-x²)÷(x²-2xy+y²)/(x-y)×(x-y)/x²=-x(x-y)÷(x-y)²/x²=-x(x-y)×x²/(
【俊狼猎英】团度为您解答~原式=[(x^2-y^2)*2(x-y)^2]/[xy(xy-y^2)]先约掉一个(x-y),分子分母同时处以y^3得到2[(y/x)^2-1]*[(y/x)-1]/[(y/
9x^2/2y再问:貌似是负的吧再答:没看见前面的“负”…………
再问:我想问的是这是你刚刚做的么........请问下能不能直接把2和7带进去算啊......?再答:对计算很简单的只是告诉你思路计算是考验你是否细心孩子自己做吧很简单的加油再问:我是说直接把2和7带
=(xy-x的平方)除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x(x-y)×xy/(x-y)2×(x-y)/x2=-y再问:嗯
=3xy×(-3x/2y)=-9x²/2
原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
[3x分之2-(x+y分之2)乘以[3x分之x+(y-x^2-xy)]除以x分之x-y{2/3x-2/(x+y)*[x/3x+(y-x²-xy)]}÷(x-y)/x题目错了吧?再问:{3x分
x/3=y/4所以x=3y/4所以(x^2-xy)/(x^2+y^2)=(9y^2/16-3y^2/4)/(9y^2/16+y^2)=-3/25
1/x+1/y=(x+y)/xy=5==>x+y=5xy所以2x-3xy+2y=2(x+y)-3xy=2*5xy-3xy=7xyx+2xy+y=5xy+2xy=7xy所以2x-3xy+2y除以x+2x
下列代数式中符合书写要求的是()C4分之x平方y