Question

2 Calculați: a 4. √0,25 + 25+5√0,36 +√196-2,5;​

Answer 1

$\sqrt{0.25 } = \sqrt{ \frac{25}{100} } = \frac{ \sqrt{25} }{ \sqrt{100} } = \\ = \frac{5}{10} {}^{(5} = \frac{1}{2}$

$\sqrt{0.36} = \sqrt{ \frac{36}{100} } = \frac{ \sqrt{36} }{ \sqrt{100} } = \\ = \frac{6}{10} {}^{(2} = \frac{3}{5}$

$\sqrt{169} = \sqrt{13 {}^{2} } = 13$

Revenim la exercițiu:

$4 \times \sqrt{0.25} + 25 + 5 \times \sqrt{0.36} + \sqrt{169} - 2.5 =$

$= 4 \times \frac{1}{2} + 25 + 5 \times \frac{3}{5} + 13 - 2.5 = \\ = \frac{4}{2} + 25 + \frac{15}{5} + 13 - \frac{25}{10} {}^{(5}=$

$= 2 + 25 + 3 + 13 - \frac{5}{2} = \\ = {}^{2)}43 - \frac{5}{2} =\frac{86-5}{2}=\frac{81}{2}$