Question

1> 234 + (345 - x ) =500

2> 456 -( x + 23 ) =326

3> ( 567 - x ) x 212 = 605

4> ( 5 x X  - 15 )  :5 = 0

5> 14 x ( x - 7 ) = 210

6> 84 -4 x ( 2 x X +1 )= 48

tim x

. 

Answer 1

1. 234 + ( 345 - x ) = 500

345 - x = 500 - 234

345 - x = 266

x = 345 - 266

x = 79

2. 456 - ( x + 23 ) = 326

x + 23 = 456 - 326

x + 23 = 130

x = 130 - 23

x = 107

3. ( 567 - x ) . 212 = 605

567 - x = 605 : 212

567 - x = ...

=> Đề sai

4. ( 5 . x - 15 ) : 5 = 0

5 . x - 15 = 0 : 5

5 . x - 15 = 0

5 . x = 0 + 15

5 . x = 15

x = 15 : 5

x = 3

5. 14 x ( x - 7 ) = 210

x - 7 = 210 : 14

x - 7 = 15

x = 15 + 7

x = 22

6. 84 - 4 x ( 2 . x + 1 ) = 48

4 x ( 2 . x + 1 ) = 84 - 48

4 x ( 2 . x + 1 ) = 36

2 . x + 1 = 36 : 4

2 . x + 1 = 9

2 . x = 9 - 1

2 . x = 8

x = 8 : 2

x = 4

Answer 2

1. 345 - x = 500 - 234

345-x=266

x=345-266

x=79

2. x+23 =456-326

x+23=130

x=130-23

x=107

4. 5 x X - 15 =5 x0 

5xX -15=0

5 x X = 0+15

5x X = 15

X = 15:5

X =3

5 . x-7 = 210 :14

x - 7 =15

x=15+7

x=22