\(\dfrac{1}{2}:0,5-\dfrac{1}{4}:0,25+\dfrac{1}{5}:0,2-\dfrac{1}{8}:0,125\)
\(=\dfrac{1}{2}\times2-\dfrac{1}{4}\times4+\dfrac{1}{5}\times5-\dfrac{1}{8}\times8\)
\(=1-1+1-1=0\)
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