Question

tìm x 

a) (3x+4):12+17=19

b) 57-4 : (2x-1 )=53

c) 45:(2x+1 )-3=0

d )36+72 : (x+1)=396

e ) 470 -(2x+3)*11=217

Answer 1

(3x+4):12+17=19

=>3x+4:12=19-17

=>(3x+4):12=2

=>3x+4=2x12

=>3x+4=24

=>3x=24-4

=>3x=20

=>x=20/3

tíc mình nha

Answer 2

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chắc tức chết mất :((((

Answer 3

a ) ( 3x + 4 ) : 12 + 17 = 19

( 3x + 4 ) : 12 = 19 - 17

( 3x + 4 ) : 12 = 2

3x + 4 = 2.12

3x + 4 = 24

3x = 24 - 4

3x = 20

x = 20 : 3

x = \(\frac{20}{3}\)

b ) 57 - 4 : ( 2x - 1 ) = 53

53 : ( 2x - 1 ) = 53

2x - 1 = 53 : 53 

2x - 1 = 1

2x = 1 + 1 

2x = 2

x = 2 : 2 

x = 1

c ) 45 : ( 2x + 1 ) - 3 = 0

45 : ( 2x + 1 ) = 0 + 3

45 : ( 2x + 1 ) = 3

2x + 1 = 45 : 3 

2x + 1 = 15

2x = 15 - 1

2x = 14

x = 14 : 2

x = 7

d ) 36 + 72 : ( x + 1 ) = 396

108 : ( x + 1 ) = 396

x + 1 = 108 : 396

x + 1 = 0,27...

x = 0,27 + 1 

x = 1,27

e ) 470 - ( 2x + 3 ) * 11 = 217

( 2x + 3 ) * 11 = 470 - 217

( 2x + 3 ) * 11 = 253

2x + 3 = 253 : 11

2x + 3 = 23

2x = 23 - 3

2x = 20

x = 20 : 2

x = 10

Answer 4

a) (3x+4):12=19-17

(3x+4):12=2

(3x+4)=2.12

(3x+4)=24

3x=24-4

3x=20

x=\(\frac{20}{3}\)

b) 57-4:(2x-1)=53

4:(2x-1)=57-53

4:(2x-1)=4

(2x-1)=4:4

(2x-1)=1

2x=1+1

2x=2

x=2:2

x=1

c)45:(2x+1)-3=0

45:(2x+1)=3

(2x+1)=45:3

(2x+1)=15

2x=15-1

2x=14

x=14:2

x=7

d) 36+72:(x+1)=396

72:(x+1)=396-36

72:(x+1)=360

x+1=72:360

x+1=0,2

x=0,2-1

x=-0,8

e) 470-(2x+3).11=217

(2x+3).11=470-217

(2x+3).11=253

2x+3=253:11

2x+3=23

2x=23-3

2x=20

x=20:2

x=10