已知y分之x等于2 求分式
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设k.x=2k,y=3k原式=-12/5
原式=(x^2-2x+1)+(y^2-4y+4)=(x-1)^2+(y-2)^2=0,所以x=1,y=2,代入问题得结果为3/2
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.
X+Y.X/Y-Y/X=(X^2-Y^2)/(xy)=(x+y)(x-y)/(xy)=x+y
由 1/X-1/Y=5,两边同乘 XY,得出Y-X=5XY,那么 分子 -X+XY+Y=6XY分母 2X+7XY-2Y=7XY-2(Y-X)=-3XY 得此分式的值为-2
由 1/X-1/Y=5,两边同乘 XY,得出Y-X=5XY,那么 分子 -X+XY+Y=6XY分母 2X+7XY-2Y=7XY-2(Y-X)=-3XY 得此分式的值为-再问:还有一题x+x分之一=
[(x-1)/2]-(x/3)=13(x-1)-2x=6x=9√x/(x+2)=3/11
1/x-1/y=2所以得:x-y=-2xy;代入下式(x-2xy-y)/(2x-3xy-2y)=(-2xy-2xy)/(-4xy-3xy)=4/7
x²+3分之x-2y的值为0∵x²+3>0∴x-2y=0∴x=2yx²-y²分之x²-3xy-4y²=(x-4y)(x+y)/(x+y)(x
x分之1-y分之1=5xy分之(y-x)=5y-x=5xy(y-x)分之xy=5xy分之xy=5分之1
1/x-1/y=5(y-x)/xy=5y-x=5xyx-y=-5xy(3x+5xy-3y)/(x-3xy-y)=【3×(-5xy)+5xy】/(-5xy-3xy)=-10xy/-8xy=5/4
2x=-yy=-2xxy/(x^2-y^2)=x*(-2x)/[x^2-(-2x)^2]=-2x^2/[x^2+4x^2]=-2x^2/5x^2=-2/5
假设x分之3=y分之4=z分之5=1,则x=3,y=4,z=53x-2y+z分之x+y+z=(3x3-2x4+5)分之(3+4+5)=6分之12=2http://zhidao.baidu.com/li
1/x-1/y=2005y-x=2005xy(-x+xy+y)/(2x+6016xy-2y)=[xy+(y-x)]/6016xy-2(y-x)]=(xy+2005xy)/(6016-4010xy)=2
3X-4y=03x=4yx:y=4:3x=4ay=3a3x²-y²分之x²+2xy=(16a^2+2x4ax3a)/(3x16a^2-9a^2)=40a^2/39a^2=
x/y+y/x=(x²+y²)/xyx²+y²=(x+y)²-2xy=36-16=20原式=20/8=2.5
y-x=3xyx-y=-3xyx-2xy-y=-5xy2x+3xy-2y=2(x+y)+3xy=-6xy+3xy=-3xy分式x-2xy-y分之2x+3xy-2y=5/3
y=4x带入3x-y=3x-4x=-xx+y=x+4x=5x(x+y)/(3x-y)=5x/(-x)=-5
两边乘以8y8(x+y)=11y8x+8y=11y3y=8xy=(8/3)x原式分子=x+y=x+(8/3)x=(11/3)x分母=x+2y=x+2(8/3)x=(19/3)x所以原式=(11/3)x