Question

Tìm x

a)346.124 - 7.(2x - 1 ) = 346

b)4/3 + 2.(5+7x)=115:5

Answer 1

Tìm x :

346 . 124 - 7 . ( 2x - 1 ) = 346

7 . ( 2x - 1 ) = ( 346 . 124 ) - 346

7. ( 2x - 1 ) = 346 . 123

7 . 2x - 7 .1 = 42558

7 . 2x = 42558 - 7

7.2. x = 42551

14 . x = 42551

=> x = \(\dfrac{42551}{14}\)
Vậy : x = \(\dfrac{42551}{14}\)

b) \(\dfrac{4}{3}\) +2 . ( 5 + 7x ) = 115 : 5

\(\dfrac{4}{3}\) + 2. 5 + 2 . 7.x = 23

\(\dfrac{4}{3}\) + 10 + 14 . x = 23

\(\dfrac{4}{3}\) + 24 . x = 23

=> \(\dfrac{76}{3}\) . x = 23

=> x = 23 : \(\dfrac{76}{3}\)

=> x = \(\dfrac{69}{76}\)

Vậy x = \(\dfrac{69}{76}\)