Question

90 - x = 15 x 1 + 15 x 2 _ Tìm x

Answer 1

90 - x = 15 x 1 + 15 x 2

90 - x = 15 + 30

90 - x = 45

x        = 90 - 45

x        = 45

Answer 2

90 - x = 15 x 1 + 15 x 2

90 - x = 15 + 30

90 - x = 45

x        = 90 - 45

x        = 45

 **** mình nhha

Answer 3

90 - x = 15 x 1 + 15 x 2

90 - x = 15 x ( 1 + 2 )

90 - x = 15 x 3 = 45

      x = 90 - 45 = 45