Question

Tim x

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

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

Answer 1

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

14x-7=42558

14x=42551

x=42551/14

b) 4/3+2(5+7x)=23

2(5+7x)=65/3

5+7x=65/6

7x=35/6

x=5/6

Answer 2

a) 346.124-7.(2x-1)=343

346.124-14x+7=343

42904-14x+7=343

-14x=343-42904-7

-14x=-42568

x=\(\dfrac{-42568}{-14}\)=\(\dfrac{42568}{14}\)=3,04

vậy x = 3,04

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

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

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

14x= \(\dfrac{35}{3}\)

x=\(\dfrac{35}{3}\):14

x=\(\dfrac{35}{42}\)=\(\dfrac{5}{6}\)