Question

Tim x 

a) 3lx-2l+2x=19 , voi \(x\ge2\)

b)\(\frac{1}{5}< \frac{x}{30}< \frac{1}{4},\)voi \(x\in N\)

MINH CAN CACH LAM 

AI NHANH MINH TK LUON

Answer 1

a) \(x\ge2\Leftrightarrow x-2\ge0\)

\(\Leftrightarrow\left|x-2\right|=x-2\)

\(3\left(x-2\right)+2x=19\)

\(\Leftrightarrow3x-6+2x=19\)

\(\Leftrightarrow5x=25\)

\(\Leftrightarrow x=5\)

b)\(\frac{1}{5}< \frac{x}{30}< \frac{1}{4}\)

\(\Leftrightarrow\frac{12}{60}< \frac{2x}{60}< \frac{15}{60}\)

Do \(x\in N\)nên ta có: \(\hept{\begin{cases}2x\in N\\2x⋮2\\12< 2x< 15\end{cases}}\)

\(\Rightarrow2x=14\)

\(\Leftrightarrow x=7\)

Answer 2

a) <=> 3x-6+2x=19

<=> 5x=25 => x=25:5=5

b)  <=> 30/5<x<30/4 <=> 6< x < 7,5

x là số tự nhiên nên x=7