通分[1]3y分之x与2y2分之3x-搜答案-神马作文网

1/(x-y)=(x+y)/(x²-y²)(xy+y²)/(x²-y²)=(xy+y²)/(x²-y²)

通分为分母是（x+y)⒉(x-y),即为2xy（x-y）/（x+y)⒉(x-y)和x（x+y）/（x+y)⒉(x-y)

问老师吧,这样比较可靠

一、(6x+1)/(x^2-x+3)(4x-3)/(-x^2+x-3)=(3-4x)/(x^2-x+3)二、3x/[(x-1)(x-2)]=3x/(x^2-3x+2)(3+x)/[(x-1)(2-x)

y1与x²成正比例,假设y1=kx²y2与x成反比例,假设y2=m/x根据题意可知y=y1+y2=kx²+m/x所以把题目已知的条件代入上式可得3=k+m.①1=k-m.

x的平方+x分之3=3/x(x+1)=3(x+1)/x(x+1)²x²+2x+1分之x+3=(x+3)/(x+1)²=x(x+3)/x(x+1)²

设y1=mx²,y2=n/x,所以y=mx²+n/x将x=1y=3与x=-1,y=1带入得：3=m+n1=m-n所以m=2,n=1所以y=2x²+1/x当x=-1/2时,

最简公分母是2(x+y)²(x-y)/2x+2y=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)²xy/(x+y)²=2×xy/2(x+y)²=2

若是：①4x²-y²和②X/(3Y-6X),则公分母是3(y-6x)；若是：①1/(4x²-y²)和②X/(3Y-6X),①=1/[(2x-y)(2x+y)],

解最简公分母2(x+y)²,∴(x-y)/(2x+2y)=(x+y)(x-y)/2(x+y)²=(x²-y²)/2(x+y)²xy/(x+y)

x/(3y)的分母是3y3x/(2y²)的分母是2y²两个分式的最简公分母是6y²,通分：x/(3y)=x×2y/(3y×2y)=2xy/(6y²)3x/(2y

3y与2y²的最简公分母是6y²3y分之x=x/(3y)=(2y×x)/(2y×3y)=(2xy)/(6y²)2y平方分之3x=3x/(2y²)=(3×3x)/

1/(X-Y)与2/(X^2-Y^2)分母最小公倍数为X^2-Y^2,所以第一个分式分子分母同乘X+Y

解x/y=3∴x=3y∴(x²+xy)/y²=(9y²+3y²)/y²=12y²/y²=12最简公分母(x-1)²(x+

解(1)：最简公分母是6(x+5)3分之x=x/3=2x(x+5)/[6(x+5)]6分之1-x=(1-x)/6=(1-x)(x+5)/[6(x+5)]x+5分之x平方-x=(x²-x)/(

(4-x的平方)分之(x的平方-2x)=x(x-2)/-(x+2)(x-2)=-x/(x+2)通分（y-x)分之1=2(x+y)(y-x)分之2(x+y)与（2x+2y）分之1=2(x+y)(y-x)

兄弟啊,你这题是不是1/（2X+2）+1/（x²+x）?如果是,那原式=1/2（x+1）+1/x（x+1）=（x+2）/2x（x+1）

解最简公分母为x(x-y)(x+y)∴1/(x²-y²)=x/x(x²-y²)=x/x(x-y)(x+y)1/(x²+xy)=(x-y)/x(x+y)

公分母是2(x+y）^2(x-y)/(2x+2y)=(x-y)*(x+y)/2(x+y)*(x+y)=(x^2-y^2)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2