a) x + 2x + 3x + ... + 100x =  15150

=> x(1 + 2 + 3 + ... + 100) = 15150

=> \(x\left(\frac{100\left(100+1\right)}{2}\right)=15150\)

=> x . 5050 = 15150

=> x = 15150 : 5050

=> x = 3

100x-100=1000

100(x-1)=1000

x-1=10

x=11

ai click mik mik click lại

100x-100=1000

100x=1000+100

100x=1100

x=1100:100

x=11

100x-100=1000

100x= 1000+100

100x= 1100

x= 1100:100

x=11

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

a , x = \(\frac{5}{2}\)

x+2x+3x+....+100x=-213

(1+2+3+...+100)x=-213

(\(\frac{100.\left(100+1\right)}{2}\))x=-213

5050.x=-213

x=-213:5050

x=-0,042 178 217

a . 2x + 48 = 60

     2x = 60 - 48 = 12

     x=12:2=6

b/3.(x+5)+8=80

  3.(x+5)=80-8=72

x+5=72:3

x+5=24

x=24-5=19

c/2x+3x=50

x . ( 2 + 3 ) = 50

x.5=50

x=50:5=10

d/ x +2x+3x+.....+99x+100x=10100

lười suy nghĩ lắm

e/x.(x+2)=0

x=0 bởi vì 0 nhân với số 2 = 0

a) 2x+48=60

=>2x=60-48

=>2x=12

=>x=12:2

x=6

\(a,2x+48=60\) 

               \(2x=60-48\)

                \(2x=12\)

                   \(x=6\)

\(b,3.\left(x+5\right)+8=80\)

      \(3x+15+8=80\)

              \(3x+23=80\)

                         \(3x=80-23\)

                          \(3x=57\)

                             \(x=19\)

\(c,2x+3x=50\)

 \(x.\left(2+3\right)=50\)

                \(5x=50\)

                   \(x=10\)