a) 170-2.(5-x)=59 b)170-2.(5-x)=50 giúp mình vs ạ

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1. a) $170$ – $2$ . $(5-x)$ = $59$

   $=>$ $2$ . $(5-x)$ = $170$ – $59$

   $=>$ $2$ . $(5-x)$ = $111$

   $=>$ $(5-x)$ = $111$ : $2$

   $=>$ $(5-x)$ = $55,5$

   $=>$ $x$ = $55,5$ – $5$

   $=>$ $x$ = $50,5$

   Vậy $x$ = $50,5$

   b) $170$ – $2$ . $(5-x)$ = $50$ 

   $=>$ $2$ . $(5-x)$ = $170$ – $50$

   $=>$ $2$ . $(5-x)$ = $120$

   $=>$ $(5-x)$ = $120$ : $2$

   $=>$ $(5-x)$ = $60$

   $=>$ $x$ = $60$ – $5$

   $=>$ $x$ = $55$

   Vậy $x$ = $55$

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2. Đáp án:

   a, $x=-\dfrac{101}{2}$

   b, $x=-55$ 

   Giải thích các bước giải:

   a,

   $170-2(5-x)=59$

   $\to 2(5-x)=170-59$

   $\to 2(5-x)=111$

   $\to 5-x=\dfrac{111}{2}$

   $\to x=5-\dfrac{111}{2}$

   $\to x=-\dfrac{101}{2}$

   b,

   $170-2(5-x)=50$

   $\to 2(5-x)=170-50$

   $\to 2(5-x)=120$

   $\to 5-x=60$

   $\to x=-55$ 

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