x + 121 = 742 x + 326 = 843 23723 - x = 1215

2 câu trả lời

Đáp án+Giải thích các bước giải:

`x+121=742`

`<=>x=742-121`

`<=>x=621`

Vậy `x=621`

__________________________

`x+326=843`

`<=>x=843-326`

`<=>x=517`

Vậy `x=517`

___________________________

`23723-x=1215`

`<=>x=23723-1215`

`<=>x=22508`

Vậy `x=22508`

 

$\text{Tìm x :}$

$\text{1, x+121=742}$

$\text{⇒x=742-121}$

$\text{⇒x=621}$

$\text{2, x+326=843}$

$\text{⇒x=843-326}$

$\text{⇒x=517}$

$\text{3, 23723-x=1215}$

$\text{⇒x=23723-1215}$

$\text{⇒x=22508}$