cứu:( 5 + x)2 - 36 = 0

2 câu trả lời

Đáp án:

$ x=13$

Giải thích các bước giải:

$(5+x)2-36=0$

$⇔10+2x-36=0$

$⇔(10-36)+2x=0$

$⇔-26+2x=0$

$⇔2x=26$

$⇔x=$`26/2`

$⇔x=13$

 

`(5 + x) . 2 - 36 = 0`

`(5 + x) . 2        = 0 + 36`

`(5 + x) . 2        = 36`

`5 + x               = 36 : 2`

`5 + x               = 18`

      `x                = 18 - 5`

      `x                = 13`

`Vậy` `x = 13`

`leminchau2909`

 

Câu hỏi trong lớp Xem thêm

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