Ответ:

[tex]1)-\frac{5}{9} *(-\frac{6}{35}) = \frac{5*6}{9*35}= \frac{2}{3*7}=\frac{2}{21}[/tex]

[tex]2)3\frac{2}{5} *(-\frac{5}{68})=-(3\frac{2}{5}*\frac{5}{68})=-(\frac{17}{5} * \frac{5}{68})=-(\frac{17*5}{5*68})=-\frac{1}{4}= -0,25[/tex]

[tex]3)(-3,5)*2*(-0,5)= -3,5*(-1)=3,5[/tex]