Question

Rozwiąż równania :

a) 2x - ( 3 - x ) = 5 + 2x

b) 5 ( 1 - 2x ) - 4x = -7

c) 1½x - ¼ = 3½ - 3/4x

d) x-1/3 + 5/12 = 2 - ¼x

e) 0,3 ( 5 - 2x ) = 2 - 0,4 ( x+ 1 )

Answer 1

a) 2x - ( 3 - x ) = 5 + 2x

2x - 3 + x = 5 + 2x

x = 8

 

b) 5 ( 1 - 2x ) - 4x = -7

5 - 10x - 4x = -7

-14x = -12

x = ⁶/₇

 

c) 1½x - ¼ = 3½ - ¾x

³/₂ - ¼ x =⁷/₂ - ³/₄x

⁶/₄ - ¼x = ¹⁴/₄ - ¾x

²/₄x = ⁸/₄

½x = 2

x = 4

 

d) x-⅓ + ⁵/₁₂ = 2 -  ¼x

⁵/₄x = ²³/₁₂

x = ²³/₁₅

 

e) 0,3 ( 5 - 2x ) = 2 - 0,4 ( x+ 1 )

1,5 - 0,6x = 2 - 0,4x - 0,4

0,2x = 0,1

x = 0,5