Calculati fracțiile vă rog!

[tex]( - \frac{7}{3} ) \times ( - \frac{15}{42} ) \times ( - \frac{9}{40} )= [/tex]
[tex]( - \frac{1}{1} ) \times ( - \frac{5}{6} ) \times ( - \frac{9}{40} )= [/tex]
[tex] \frac{5}{6} \times ( - \frac{9}{40} )= [/tex]
[tex]\frac{1}{2} \times ( - \frac{3}{8} )= [/tex]
[tex] = - \frac{3}{16} [/tex]