通分x的平方减9分之2与6减2x分之x

x平方加4x分之x+4=(x+4)/x(x+4)=1/xx(x-5)减2(x减5)分之x减5=(x-5)/[(x-2)(x-5)]=1/(x-2)

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)

是3道题么?第一个（8x-1)/2x第二个(4x^2-x)/4第三个(4x^2-16x+3)/4再问：合起来的一道题通分:4-2x分之1x的平方-4分之xx的平方-4x+4分之3再答：16x-2/4x

先把各个分式的分母分解因式,找到最简公分母.因为9-3a=3（3-a）,a²-9=（a-3）(a+3),a²-6a+9=(a-3)²所以最简公分母是3(a+3)(a-3)

5/(-2a),2/(9a^2b^3)－45ab^3/(18a^2b^3),4/(18a^2b^3),再问：约分（3x的立方+6x的平方y）分之（x的立方-4xy的平方）再答：（x^3-4xy^2)/

1x³+1x²+-----=－－－－－xx-1x²(2x+1)-12x³+x²-1x²+-----------=--------------

x²-y²=(x+y)(x-y)所以最简公分母(x+y)²(x-y)所以2xy/(x+y)²=2xy(x-y)/(x+y)²(x-y)x/(x&sup

2xy/(x+y)的平方=2xy(x-y)/(x+y)²(x-y)x/x的平方-y的平方=x(x+y)/(x+y)²(x-y)

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

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

2xy/(x+y)^2=2xy(x-y)/[(x+y)^2(x-y)]=(2x^2y-2xy^2)/[(x+y)^2(x-y)]x/(x^2-y^2)=x(x+y)/[(x+y)(x-y)*(x+y)

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(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）

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

x的平方-x-2分之x=（x+1)乘以（x-2)分之x=(x+1)乘以（x-2）方分之x（x-2）x的平方-4x+4分之一=（x-2）方分之一=(x+1)乘以（x-2)方分之（x+1)