[tex]a) \ 0,8 \cdot0,03=8\cdot0,1\cdot3\cdot0,01=24\cdot0,001=\boxed{0,024}[/tex]
[tex]b) \ 0,012:0,004=12:4=\boxed{3}[/tex]
[tex]c) \ 0,009:0,03=0,9:3=\boxed{0,3}[/tex]
[tex]d) \ 0,004\cdot0,65=4\cdot0,001\cdot65\cdot0,01=260\cdot0,00001=\boxed{0,0026}[/tex]
[tex]e) \ 16\cdot2,9\cdot7,4=[16\cdot3-16\cdot0,1]\cdot7,4=(48-1,6)\cdot7,4=\\\\=46,4\cdot7,4=46,4\cdot7+46,4\cdot0,4=324,8+464\cdot4\cdot0,01=\\\\=324,8+1856\cdot0,01=324,8+18,56=\boxed{343,36}[/tex]
[tex]f) \ 0,856:0,016:0,5=856:16\cdot2=\frac{856}{\not16_{8}}\ \cdot\not2= 856:8=\boxed{107}[/tex]
