Question

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

Answer 1

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