4x/5-4+5x/3=3

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4x/5-4+5x/3=3
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x

是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)(x^2+x+1)+x^2+x

x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+3x+4x+5x+x+6x+7x=100

2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7

x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4

/>(x+2)/(x+1)-(x+3)/(x+2)-(x+4)/(x+3)+(x+5)/(x+4)=1+1/(x+1)-1-1/(x+2)-1-1/(x+3)+1+1/(x+4)=1/(x+1)-1/(x+2)-1/(x+3)+1/(x+4

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^5)(1+x+x^2+x^3)=(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^|10=a^*(10-10)+a=9!

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。。。

4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½

4x²-{-3x²-[5x-x²-(2x²-x)]+4x}=4x²-[-3x²-(5x-x²-2x²+x)+4x]=4x²-(-3x²-5x

解方程(x-2)/(x-3)-(x-3)/(x-4)=(x-5)/(x-6)-(x-6)/(x-7)

((X-2)(X-4)-(X-3)^2)/(X-3)(X-4)=((X-5)(X-7)-(X-6)^2)/(X-6)(X-7),-1/(X^2-7X+12)=-1/(X^2-13X+42),6X=30,X=5.

解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)

(x+3)/(x+2)+(x+9)/(x+8)=(x+5)/(x+4)+(x+7)/(x+6)1+(x+5)/(x+2)(x+8)=1+(x+5)/(x+4)(x+6)x=-5再问:第二步那个1是怎么算出来的??再答:先两边通分,分子两边都

解分式方程 x-7/x-9+x-3/x-5=x-4/x-6+x-6/x-8

将x-7/x-9分解成1+2/(x-9)其他分式同理则原方程等价于1/x-9+1/x-5=1/x-6+1/x-81/x-6-1/x-5=1/x-9-1/x-81/(x-5)(x-6)=1/(x-8)(x-9)(x-5)(x-6)=(x-8)

(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)-(x-9)(x-6)】/【(x-6)

(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+7)1/(x+1)-1/(x+3)=1/

解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)

2x+4x+6x...+100x=1-(x+3x+5x+...+99x)x(2+4+6+...+100)=1-x(1+3+5+...99)x(2+4+6+...+100)+x(1+3+5+...+99)=1x(1+2+3+...+100)=

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+3+1)/(x+3)即1+1/(x+

(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]=整数+k*整数+k^2*整数+k^3

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=5x=5\28

解方程 x(2x-4)+3x(x-1)=5x(x-3)+8

x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1

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