[tex]a)( 5\sqrt{6} ) \times (2 \sqrt{15}) \div (15 \sqrt{5)} [/tex]
[tex]b)(3 \sqrt{12} ) \times ( - \sqrt{8} ) \div (6 \sqrt{6} )[/tex]

[tex]c)( - 2 \sqrt{6} ) \times \frac{1}{4} \sqrt{8} ) \div ( \frac{3}{4} \sqrt{12} )[/tex]
ajutor pls am nevoie urgent​