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calculați media aritmetică a nr 0,(7)si0,2(5)​

Răspuns :

[tex]\it 0,2(5)=\dfrac{25-2}{90}=\dfrac{23}{90}\\ \\ \\ 0,(7)=\dfrac{^{10)}7}{\ 9}=\dfrac{70}{90}\\ \\ \\ m_a=\dfrac{\dfrac{23}{90}+\dfrac{70}{90}}{2}=\dfrac{93}{2\cdot90}=\dfrac{93}{180}=0,51(6)[/tex]