Explicație pas cu pas:
[tex] \sqrt{6 \times 24} = \sqrt{144} = 12[/tex]
[tex] \sqrt{0.4 \times 90 } = \sqrt{ \frac{4}{10} \times 90 } = \sqrt{36} = 6[/tex]
[tex] \sqrt{ \frac{4}{5} } \times \sqrt{ \frac{9}{5} } = \sqrt{ \frac{36}{25} } = \frac{6}{5} [/tex]
[tex] \sqrt{28 \times \frac{7}{4} } = \sqrt{7 \times 7} = \sqrt{49} = 7[/tex]
