a: \(\left|x-2\right|>=0\forall x\)
=>\(-\left|x-2\right|< =0\forall x\)
=>\(-\left|x-2\right|+5< =5\forall x\)
=>\(A< =5\forall x\)
Dấu '=' xảy ra khi x-2=0
=>x=2
b: \(\left|5x-1\right|>=0\forall x\)
=>\(2\left|5x-1\right|>=0\forall x\)
=>\(2\left|5x-1\right|+1>=1\forall x\)
=>\(\dfrac{4}{2\left|5x-1\right|+1}< =\dfrac{4}{1}=4\forall x\)
=>\(B< =4\forall x\)
Dấu '=' xảy ra khi 5x-1=0
=>5x=1
=>\(x=\dfrac{1}{5}\)
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