1.c/2ab+b/3a^2c-a/5c^22.2x+2+(5/x-1)3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)4.(x/a-y+y/y-x)/(xy/x-y)5.(3-m/2m-4)/(m+2-5/m-2)6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3 7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)9.[1/a^2 + 1/

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1.c/2ab+b/3a^2c-a/5c^22.2x+2+(5/x-1)3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)4.(x/a-y+y/y-x)/(xy/x-y)5.(3-m/2

1.c/2ab+b/3a^2c-a/5c^22.2x+2+(5/x-1)3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)4.(x/a-y+y/y-x)/(xy/x-y)5.(3-m/2m-4)/(m+2-5/m-2)6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3 7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)9.[1/a^2 + 1/
1.c/2ab+b/3a^2c-a/5c^2
2.2x+2+(5/x-1)
3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
4.(x/a-y+y/y-x)/(xy/x-y)
5.(3-m/2m-4)/(m+2-5/m-2)
6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3
7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)
8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)
9.[1/a^2 + 1/b^2 + (2/a+b)(1/a+1/b]/[(a+b)^2/ab]
10.已知x^2-3x+1=0求 1.x+1/x 2.x^2+1/x^2 3.x^4+1/x^4的值
11.化简x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3 并求x=2006时的值
12.化简(x^2+4x+4/x^2-6x+9 -2+ 9-6x+x^2/4+4x+x^2)*x^2-x-6/4x^2-4x-1
麻烦有过程都写出来

1.c/2ab+b/3a^2c-a/5c^22.2x+2+(5/x-1)3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)4.(x/a-y+y/y-x)/(xy/x-y)5.(3-m/2m-4)/(m+2-5/m-2)6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3 7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)9.[1/a^2 + 1/
1.c/2ab+b/3a^2c-a/5c^2
=(15a*c^2+10b^2-6a^3*b)/30a^2*b*c^2
2.2x+2+(5/x-1)
=2x+5/x+1
3.(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
=(a+2)+(a+4)
=2a+6
4.[x/(x-y)+y/(y-x)]/(xy/x-y)
=1/y+1/x
5.[(3-m)/(2m-4)]/[m+2-5/(m-2)]
=-1/2(m+3)
6.(a+1/2a-2 -3/2a^2-2 -a+3/2a+2)* 4a^-4/3
=[(a+1)^2-3-(a+3)(a-1)]/(a^2-1)*4a^-4/3
=(4a^-4/3 )/(a^2-1)
7.(a-b/a+b-a+b/a-b)/(1- a^2+b^2/a^2-2ab+b^2)
=[-4ab/(a^2-b^2)]/[-2ab/(a-b)^2]
=2(a-b)^2/(a^2-b^2)
8.[(1+ 4/x-2)(x-4+ 4/x)-3]/(4/x -1)
={[(x^2-4)/x]-3}/[(4-x)/x]
=-x-1
9.[1/a^2 + 1/b^2 + (2/a+b)(1/a+1/b]/[(a+b)^2/ab]
=(1/a^2+1/b^2+2/ab)[ab/(a+b)^2]
=1/ab
10.已知x^2-3x+1=0求 1.x+1/x 2.x^2+1/x^2 3.x^4+1/x^4的值
x^2-3x+1=0,两边都除以x
得x+1/x=3
平方x^2+2+1/x^2=9
得x^2+1/x^2=7
同理x^4+1/x^4=47
11.化简x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3 并求x=2006时的值
x-2/x^9-9(1+ 2x-7/x^2-4x+4)/ 1/x+3
这个题目你再写清楚点,实在不好做.
12.化简(x^2+4x+4/x^2-6x+9 -2+ 9-6x+x^2/4+4x+x^2)*x^2-x-6/4x^2-4x-1
=[5（2x-1）/(x-3)^2-5(2x-1)/(x+2)^2]*(x-3)(x+2)/(2x-1)^2
=25/(x+2)(x-3)

你X上面的小*不好理解

好乱，解法好多

Hao Ti!

第10题，x=(3±根号5)/2,两个根互为倒数，所以x1+x2=3,韦达定理

分式这样书写,不好理解
误解很多

通分 b/3a²c²,c/2ab,a/5b³c 2a(a+b-c)-3b(a+b-c)+5c(c-a-b) 24ab^2c^2(a+b-c)-32abc(a-c-b)^2+8abc^3(c-a-b) 初二数学竞赛计算题,在线等!1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]4. [-ac/(a-b) 若a^2+b^2=c^2,ab=3则(a+b+c)(a-b+c)(a+b-c)(-a+b-c) (a-b+c/a+b-c)-(a-2b+3c/b-c+a)+(b-2c/c-a-b) 设a,b,c属于正数,利用排序不等式证明1.a^ab^b>a^bb^a(a不等于b)2.(a^2a)(b^2b)(c^2c)>=[a^(b+c)][b^(c+a)][c^(a+b)] 已知:(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)=5/132,求a/(a+b)+b/(b+c)+c/(c+a)的值!(请尽快,我有急用,a/(a+b)+b/(b+c)+c/(c+a)=1/2[（a-b)/(a+b)+（b-c)/(b+c)+（c-a)/(c+a)]+3/2 （a-b)/(a+b)+（b-c)/(b+c)+（c-a)/(c+a) 没有错吧... (a+b)c^3-(a^2+ab+b^2)c^2+a^2b^2 因式分解 化简：7(a-b-c)-5(a+b-c)+3(a-b-c)+(a+b-2) a,b,c是正整数,则满足不等式3+a²+b²+c²≤ab+3b+2c-1.求a.b.c的值 2(a^2b-2ab^2+c)-(2c+3a^2b-ab^2) 2(a²b-2ab²+c)-(2c+3a²b-ab²) (a+b+c)(a^2+b^2+c^2-ab-ac-bc)+3ab= 若a>b>c,a+2b+3c=0,ab>ac与ab （1）代数式a-b+c的相反数是（ ）A.a-b+c B.b-a+c C.c-a+b D.b-a-c(2)已知a+b=5,ab=－3,求代数式(2a-3b-2ab)-(a-4b-ab)的值(3)一条数轴 c 因式分解:ab*b+c*c+ca*a+a*ab+b*bc+c*ca+2abc 通分：b/3a^2c^2,c/2ab,a/5cb^2