Question

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tìm số nguyên x biết 

a ,3x - 32 > -5x + 1

b ,15 + 4x < 2x - 145

Answer 1

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\(a,3x-32>-5x+1\)

\(\Leftrightarrow3x+5x>32+1\)

\(\Leftrightarrow8x>33\)

\(\Leftrightarrow x>\frac{33}{8}=4,125\approx4\)

Vậy \(x>4,x\inℤ\)

\(b,15+4x< 2x-145\)

\(\Leftrightarrow4x-2x< -145-15\)

\(\Leftrightarrow2x< -160\)

\(\Leftrightarrow x< \frac{-160}{2}=-80\)

Vậy \(x< -80,x\inℤ\)