=\(\frac{4026}{2011}\)

10000000pp

Ta có: \(x+2x+3x+\cdots+2010x+2011x=2012\cdot2013\)

=>\(x\left(1+2+3+\cdots+2011\right)=2012\cdot2013\)

=>\(x\cdot2011\cdot\frac{\left(2011+1\right)}{2}=2012\cdot2013\)

=>\(x\cdot\frac{2011}{2}\cdot2012=2012\cdot2013\)

=>\(x=2013:\frac{2011}{2}=2013\cdot\frac{2}{2011}=\frac{4026}{2011}\)

a)<=> 3x-5-x=0

   <=>    2x-5=0

   <=>        x=5/2

c) x.(1+2+3+4+...+100)=0

    x.5050=0

     x=0:5050=0

Vậy x=0

d) x.(1+2+3+4+5+...+100)=5050

    x.5050=5050

    x=1

Vậy x=1

e) x+1+x+2+x+3+x+4+...+x+100=5050

    (x+x+x+x+...+x)+(1+2+3+4+...+100)=5050

     100 số hạng x

    x.100+5050=5050

    x.100=0

    x=0

Vậy x=0

(1+2+3+4+...+10)x=-165

55x=-165

x=-165:55

x=-3

các bạn cho mk vài li-ke cho tròn 730 với 

=> 55x = -165

=> x = -165 : 55

=> x = -3

x=103/23

-[-3x+2(45-x-9x+21-2x)+4x=55       

-[-3x+2(24-12x)+4x]=55

-(-3x+48-24x+4x)=55

-(48-23x)=55

23x=55+48

x=103/23

Xem lại dùm mink nha

Ta có;

x+2x+3x+4x+...+9x=1000-100

=>x+2x+3x+4x+...+9x=900

=>(1+2+3+4+....+9)x=900

=>[(1+9).9:2]x=900

=>45x=900

x=900:45=20

cho tớ đúng nha

Ta có;

x+2x+3x+4x+...+9x=1000-100

=>x+2x+3x+4x+...+9x=900

=>(1+2+3+4+....+9)x=900

=>45x=900

x=900:45=20

a) x= - 15

b) x= - 2

c) x= -12 

d) x= -2 

Câu a:

(3x + 2016) - (2x - 15) = 2016

3x + 2016 - 2x + 15 =2016

3x -2x = 2016 - 2016 - 15

x = 0 - 15

x =- 15

Vậy x =- 15