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Ответ:вот

Объяснение:

[tex]\sqrt{0,5} ^{2} -0,4^{2} \\0,5-0,4^{2} \\0,5-(\frac{2}{5})^{2} \\ \frac{1}{2} -(\frac{2}{5})^{2} \\ \frac{1}{2} -\frac{4}{25}\\\frac{17}{50} = 0,34[/tex]