1 x-7-1 x-5=

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1 x-7-1 x-5=
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1

这是两道题吗?1、两边同时乘(x-1)(x-2)(x-3)答案是x1=-1,x2=22、分母因式分解分别为(x-7)(2x+3)和(x-5)(x-7)然后同时乘(x-5)(x-7)(2x+3)答案是x

y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1

设a=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)那么y=a*(x-10);那么y^=a^*(x-10)+a*(x-10)^=a^*(x-10)+a那么y

(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8

1)(x-3)/(x-2)-(x-5)/(x-4)=(x-7)/(x-6)-(x-9)/(x-8)化简得【(x-3)(x-4)-(x-5)/(x-2)】/【(x-2)(x-4)】=【(x-7)(x-8

设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),

 再问:额、不懂再答: 再答:后面的看做一个整体再问:好的吧、谢谢大神再答:回来的话,请采纳再问:啊、突然明白了呢。。。

(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)

(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)(X+1+1)/(X+1)-(X+3+1)/(X+3)=(X+5+1)/(X+5)-(X+7+1)/(X+

已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值

x+x^2+x^3+x^4+x^5+x^6+x^7+x^8=(x+x^2+x^3+x^4)+(x^5+x^6+x^7+x^8)=x(1+x+x^2+x^3)+x^5(1+x+x^2+x^3)=(x+x

解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7)

我给个思路吧(X+2-1/X+2)-(X+3-1/X+3)=(X+6-1/X+6)-(X+7-1/X+7)1-1/(X+2)-1+1/(X+3)=1-1/(X+6)-1+1/(X+7)剩下的就自己解决

已知3x*x-x=1,求6x*x*x+7x*x-5x+2000

3x*x=1+x得6x*x*x+7x*x-5x+2000=3x^2*2x+7x^2-5x+2000=(1+x)2x+7x^2-5x+2000=9x^2-3x+2000=3(3x^2-x)+2000=3

(4x+2)/x+(4x-22)/(x-5)=(x-6)/(x-4)+(7x+9)/(x+1)

/>(4X+2)/X+【4(X-5)-2】/(X-5)=【(X-4)-2】/(X-4)+【7(X+1)+2】/(X+1)4+2/X+4-2/(X-5)=1-2/(X-4)+7+2/(X+1)8+2/X

3x(7-2x)+5x(2x-1)=4x(x-3)+56

你算错了.X平方项等式两边化掉了.最后算出X=2

3x(7-2x)+5x(2x-1)=4x(x-3)+5

正确答案确实是5\28,你算得很对;原式为3x(7-2x)+5x(2x-1)=4x(x-3)+521x-6x^2+10x^2-5x=4x^2-12x+516x+4x^2=4x^2-12x+528x=5

解方程:x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6

通分化简得到(x+1)(x+2)=(x+5)(x+6)3x+2=11x+308x=-28x=-7/2

x+3/x+1-x+5/x+3-x+7/x+5+x+9/x+7=0

同分化简得32x+128/(x+1)(x+3)(x+5)(x+7)=0所以得x=-4给分吧算了好久的····

解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3

首先由题意得x+1≠0,x+7≠0,x+5≠0,x+3≠0,即x≠-1,x≠-7,x≠-5,x≠-3,则先简化方程(x+1+1)/(x+1)+(x+7+1)/(x+7)=(x+5+1)/(x+5)+(

X-5+8*X=7*X-2*X-1

变形得9X—5=5X—1得4X=4得X=1再答:有不懂的再问再问:对啊……我就是想知道怎么变形……不过你这个比较详细一些……再问:右边是7-2变形,那左边是……再答:就是把未知数X移到一边再问:右边是

2x(7-3x)+5x(2x+1)=x(4x-3)+32

14x-6x²+10x²+5x=4x²-3x+3222x=32∴x=16/11

(3-x)/(1-x)-(5-x)/(7-x)+(x^2-x)/(x^2-8x+7)=1

解(x-3)(x-7)/(x^2-8x+7)-(x-5)(x-1)/(x^2-8x+7)+(x^2-x)/(x^2-8x+7)=1x^2-10x+21-(x^2-6x+5)+x^2-x=x^2-8x+

x-1\x-2+x-6\x-7=x-2\x-3+x-5\x-6 分式方程

X-1/X-2-(X-2)/(X-3)=(X-5)/(X-6)-(X-6)/(X-7)(X-1)(X-3)-(X-2)²/(X-2)(x-3)=(X-5)(X-7)-(X-6)²/

(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几?

首先,等式两边不能同时为0..而且x为整数..证明很简单..若x是实数,不是整数,设x的小数部分为k,整数部分x-k=m,则左侧为[(m-1)+k][(m-2)+k][(m-3)+k][(m-4)+k