Mẫu cho mấy bài rồi tự làm nha
a) \(2x+2>4\)
\(\Leftrightarrow2x>2\)
\(\Leftrightarrow x>1\)
b) \(3x+2>-5\)
\(\Leftrightarrow3x>-7\)
\(\Leftrightarrow x>-\dfrac{7}{3}\)
c) \(10-2x>2\)
\(\Leftrightarrow-2x>2-10\)
\(\Leftrightarrow-2x>-8\)
\(\Leftrightarrow x< 4\)
3 câu cuối tương tự mà làm
a) 2x + 2 > 4
<=> 2x > 2
<=> x > 1
\(S=\left\{x|x>1\right\}\)
b) 3x + 2 > -5
<=> 3x > -7
<=> x > \(-\dfrac{7}{3}\)
\(S=\left\{x|x>-\dfrac{7}{3}\right\}\)
c) 10 - 2x > 2
<=> -2x > -8
<=> x < 4
\(S=\left\{x|x< 4\right\}\)
d) 1 - 2x < 3
<=> -2x < 2
<=> x > -1
\(S=\left\{x|x>-1\right\}\)
e) 10x + 3 - 5x \(\le\) 14x + 12
<=> 10x - 14x - 5x \(\le\) 12 - 3
<=> -9x \(\le\) 9
<=> \(x\ge-1\)
\(S=\left\{x|x\ge-1\right\}\)
f) 3x - 1 < 2x + 4
<=> 3x - 2x < 4 + 1
<=> x < 5
\(S=\left\{x|x< 5\right\}\)
