Question

Помогите плз решить !!!

Answer 1

$\sqrt{2,5^{2}-2,4^{2}}= \sqrt{( \frac{5}{2})^{2}- (\frac{12}{5})^{2} } = \sqrt{ \frac{25}{4}- \frac{144}{25} } = \sqrt{ \frac{625-576}{100} } = \sqrt{ \frac{49}{100} } = \\ \\ = \frac{7}{10}=0,7$

ll способ ( по формуле ):

$\sqrt{2,5^{2}-2,4^{2}} = \sqrt{(2,5-2,4)(2,5+2,4)}= \sqrt{0,1*4,9}= \sqrt{0,49}=0,7$