2 x 1,2 4x²-25通分

1/(x+2),4x/(x²-4),2/(2-x)公分母是x²-4=(x+2)(x-2)1/(x+2)=(x-2)/(x²-4)4x/(x²-4)2/(2-x)

题目不明白.x平方+x分之1还是（x平方+x）分之1?“x平方+x分之1,x平方+2x+1分之-1”中“,”是什么东东

一、约分（1）5x/25x²=1/5x（2）9a²+6ab+b²/3a+b=(3a+b)²/(3a+b)=3a+b二、通分(1)x/3y与3x/2y²

通分1/x平方-y平方和1/x平方+xy1/x平方-y平方=x/x(x+y)(x-y)1/x平方+xy=(x-y)/x(x+y)(x-y)通分x/x平方-4和x-1/（x-2）平方x/x平方-4=x(

1/(x²+2x)+1/(x²-x)=1/x(x+2)+1/x(x-1)=(x-1)/x(x+2)(x-1)+(x+2)/x(x+2)(x-1)通分后分母是x(x+2)(x-1)

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

计算是结果相加还是怎么的?

1,(X×3X)/3X+1/3X=(3X^2+1)/3X2,X/2X+(6×2X）/2X=(X+12X)/2X=13/23,(X-1)/X^2-[(9×X^2)/X^2]=[X-1-(9X^2)]/X

第一个式子上下同乘x-y得2x平方y-2xy平方/（x+y)(x平方-y平方）第二个式子上下同乘x+y得x平方y/（x+y)(x平方-y平方）分母一样了

通分3/2x²与2/x²-x解,得：他们变形后得3/2x^22/x(x-1)通分后得3x(x-1)/2x^2(x-1)4x^2/2x^2(x-1)再问：没看懂，你能用画图的方式写出

解题思路：芳芳1步长为6÷10=3/5=21/35（米）佳佳1步长为4÷7=4/7=20/35（米）21/35>20/35所以芳芳1步长一些。解题过程：解：芳芳1步长为6÷10=3/5=

（x-y)/(2x+2y)=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2x-y/2x+2y=(x^2-y+4xy)/2x=(x^2-y

x-1\x^3-x,x+1\x^3-x1\2xx-y\x+y先因式分解再通分和约分再问：通分和约分的过程能详细列出来吗？谢谢。再答：1　　1／x²＋x=1/x(x+1)=x-1/x(x+1)

1/(a-b),1/(b-c),1/(a-c)最简公分母：[(a-b)(b-c)(a-c)]

1/2x+3=2x-3/4x²-92/3-2x=-4x-6/4x²-92x+5/4x^2-9

1/ac;1/2b[通分]2b/2abc;ac/2abc1/x-1;4/x^2-1[通分]x+1/(x+1)(x-1);4/(x+1)(x-1)3/x-2;2/6-3x[通分]9/3(x-2);-2/

1/x^2+x=1/x(x+1)=(x+1)/x(x+1)^2-1/x^2+2x+1=-1/(x+1)^2=-x/x(x+1)^2

解最简公分母为：2x(x+1)(x-1)x/(2x+2)=x²(x-1)/[2x(x+1)(x-1)]1/(x²+x)=2(x-1)/[2x(x+1)(x-1)]1/(x²

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)

不太明白你的意思,是二个多项式通分同分母吗?(x+4)/(x^2+4x)=(x+4)/[x(x+4)]=1/x=(x-2)/[x(x-2)(x-5)/[x(x-5)-2(x-5)]=(x-5)/[(x