10 + 2x =20

= 10 + 2.1=20 

10+2x=20

  2x=20-10=10

  x=10:2=5

Vậy x=5

10 + 2x = 20

       2x = 20 - 10

       2x = 10

         x = 10 : 2

         x = 5

đây là toán lớp 6 ko phải lớp 1

\(10+2x=20\)

công thức ta có

\(2x=2.x\)

nên

\(10+2x=20\)= \(10+2.x=20\)

= 20 - 10 : 2

= 5

học thì có lợi ^^

chơi thì có hại^^

vừa học vừa chơi...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................nó thật lợi hại

10 + 2 x = 20

       2 x = 20 - 10

       2 x = 10

         x = 10 : 2

        x = 5

x=5 nha bn 

x=5 nha bn

10 + 2x = 20

2x = 20 - 10

2x = 10

x = 10 : 2

x = 5

\(10+2\times=20\)

             \(2\times=20-10\)

             \(2\times=10\)

             \(2\times=10:2\)

             \(2\times=5\)

\(nha\)\(ban\)Nguyễn Minh Phương