[tex]a)~~\sqrt{15} \cdot\sqrt{15}=(\sqrt{15})^2=15\\b)~~\sqrt{8} \cdot\sqrt{8}=(\sqrt{8})^2=8\\c)~~\sqrt{102} \cdot\sqrt{102}=(\sqrt{102})^2=102\\d)~~\sqrt{\frac12} \cdot\sqrt{\frac12}=(\sqrt{\frac12})^2=\frac12\\e)~~\sqrt{\frac78} \cdot\sqrt{\frac78}=(\sqrt{\frac78})^2=\frac78\\f)~~\sqrt{7\frac34} \cdot\sqrt{7\frac34}=(\sqrt{7\frac34})^2=7\frac34[/tex]
