Question

Tìm x :

10 + 5 = 20 - x

Answer 1

\(15=20-x\)

\(x=20-15\)

\(x=5\)

Answer 2

10+5=20-x

  15  =20-x

  20-15=x

      5   =x

x=5

Answer 3

10+5=20-x

15=20-x

=>x=20-15

x=5

Answer 4

10 + 5 = 20 - x

15 = 20 - x

x = 5

Answer 5

10 + 5 = 20 - x

20 - x = 15

x = 10 - 15

x = 5

Vậy x = 5

Answer 6

10 + 5 = 20 - x

15       = 20 - x

 x        = 20 - 15

 x        = 5

Answer 7

10 + 5 = 20 - x

15 = 20 - x

20 - 15 = x

5 = x

=> x = 5

Answer 8

 10 + 5 =20 -x

 10 + x = 20 - 5

10 + 5 = 15