Question

Tìm x biết

56 - ( 25+x ) = 21

3x - 42 = 3 . 2³

3x + 2x = 35

( x + 2)² = 64

Answer 1

a: =>x+25=35

=>x=10

b: =>3x-42=3x8=24

=>3x=66

=>x=22

c: =>5x=35

=>x=7

Answer 2

`56 - ( 25+x ) = 21`

`25+x = 56 -21 =35`

`x = 35-25=10`

Vậy `x=10`

`3x-42 =3*2^3`

`3x-42 = 3*8=24`

`3x =24+42 =66`

`x = 66/3 = 22`

Vậy `x=22`

`3x + 2x = 35`

`x(3+2) =35`

`5x=35`

`x =35/5 =7`

Vậy `x=7`

Answer 3

56-(25+x)=21

=>25+x=56-21

=>25+x=35

=>x=35-25

=>x=10

Vậy x=10

Answer 4

3x-42=3×2^3

=>3x-42=3×8

=>3x-42=24

=>3x=24+42

=>3x=66

=>x=66÷3

=>x=22

Vậy x=22

 

Answer 5

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