﹣3xy÷3x分之2y²

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分式通分:xy分之2,xy-x的平方分之3y

2/xy=2(y-x)/xy(y-x)3y/(xy-x^2)=3y^2/xy(y-x)如果不懂,请追问,祝学习愉快!

x²-2xy+y²分之x²+2xy-3y³如何因式分解

(x+3y)(x-y)/(x-y)(x-y)=x+3y/x-y再问:那当y分之x=3,这个分式的值等于多少?再答:x+3y/x-y=3y+3y/3y-y=6y/2y=3

计算:2x+2y分之3y + x²+xy分之2xy

2x+2y分之3y+x²+xy分之2xy=3y/2(x+y)+2xy/x(x+y)=3y/2(x+y)+2y/(x+y)=7y/2(x+y)如追加其它问题,再问:这道题要通分,能不能化成同分

计算(3y分之2x)×(4y分之3x)÷(4分之1xy)

=(2X/3Y)*(3X/4Y)*(4/xy)=(2x*3x*4)/(3y*4y*xy)=2x/(y^3)

已知y分之x=3,求x²-xy+y²分之x²+2xy-3y²

x/y=3x=3y(x²+2xy-3y²)/(x²-xy+y²)=(9y²+6y²-3y²)/(9y²-3y²

已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!

因为x-y=4xy所以x-2xy-y=2xy2x+3xy-2y=11xyx-2xy-y分之2x+3xy-2y=5.5

当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值

3xy-[2xy-2(xy-2分之3xy)+xy]+3xy=6xy-[2xy-2xy+3xy+xy)=6xy-4xy=2xy=2×3×3分之1=2

已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=

xy/(x+y)=2∴xy=2(x+y)(3xy-x-y)/(3x-5xy+3y)=[6(x+y)-x-y]/[3x+3y-10(x+y)]=5(x+y)/[-7(x+y)]=-5/7

已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y

因为X+Y分之XY=2,所以XY=2(X+Y)代入后面的分子式得:13(X+Y)/5(X+Y)=13/5

2x+2y分之3y+x^2+xy分之2xy

原式=3y/2(x+y)+2xy/x(x+y)=(3xy+4xy)/2x(x+y)=7xy/2x(x+y)=7y/(2x+2y)再问:不对再答:哦,不信就算了

(x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1

(x+2y-3xy)-(-2x-y+xy)=x+2y-3xy+2x+y-xy=(1+2)x+(2+1)y-(3+1)xy=3x+3y-4xy=3(x+y)-4xy=3*1/2-4*(-1/2)=3/2

(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]

原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)

3xy的平方-[(xy-2分之3x平方y)+xy],其中x=3,y=﹣3分之1

原式=3x²y-(2xy-2xy+3x²y+xy)=3x²y-(3x²y+xy)=3x²y-3x²y-xy=-xy=-3×(-1/3)=1

2x+2y分之3y 加 x²+xy分之2xy

3y/(2x+2y)+2xy/(x²+xy)=3y/(2x+2y)+2y/(x+y)=3y/(2x+2y)+4xy/(2x+2y)=7y/(2x+2y)

已知x-y分之xy= - 3分之1,求x-2xy-y分之2x+3xy-2y的值

x-y分之xy=-3分之1xy分之(x-y)=-3x-y=-3xyx-2xy-y分之2x+3xy-2y=(-6xy+3xy)/(-3xy-2xy)=3/5

3x的平方y-{2xy-2{xy-2分之3x的平方y}+xy

3x²y-{2xy-2(xy-3/2x²y)}+xy=3x²y-{2xy-2xy+3/2x²y}+xy=3x²y-2xy+2xy-3/2x²

几道数学题:x-x^2分之x^2-1×1-y分之xy-x,(xy-x^2)÷xy分之x-y,x^2+x分之x-3÷(x^

x-x^2分之x^2-1×1-y分之xy-x=(x+1)(x-1)/x(1-x)*[x(y-1)]/(1-y)=(x+1)/(-x)*(-x)=x+1(xy-x^2)÷xy分之x-y=x(y-x)*x

若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?

xy/(x+y)=2(x+y)/xy=1/21/x+1/y=1/2(3x-xy+3y)/(-x+3xy-y)=(3/y-1+3/x)/(-1/y+3-1/x)=[3(1/x+1/y)-1]/[(3-(

已知X+Y分之XY等于3,求-X+3XY-Y分之2X-3XY+2Y

设x+y=axy=b,则b/a=3b=3a所以-X+3XY-Y分之2X-3XY+2Y可以写成(2a-3b)/(3b-a)=-7/8