a)[tex]\frac{8}{21}[/tex] × 8[tex]\frac{3}{4}[/tex] = [tex]\frac{8}{21}[/tex] [tex]\frac{3+8*4}{4}[/tex]=[tex]\frac{8}{21}[/tex]×[tex]\frac{35}{4}[/tex]=[tex]\frac{8*35}{21*4}[/tex] = [tex]\frac{280}{84}[/tex] = [tex]\frac{10*28}{3*28}[/tex] =[tex]\frac{10}{3}[/tex] =3 [tex]\frac{1}{3}[/tex]≈3,333333
b) 6[tex]\frac{2}{3}[/tex] * [tex]\frac{9}{16}[/tex] = [tex]\frac{2+6*3}{3}[/tex] * [tex]\frac{9}{16}[/tex] = [tex]\frac{20}{9}[/tex] * [tex]\frac{9}{16\\}[/tex] = [tex]\frac{20*9}{3*16}[/tex] = [tex]\frac{180}{48}[/tex] = [tex]\frac{15*12}{4*12}[/tex] = [tex]\frac{15}{4}[/tex] = [tex]\frac{3*4+3}{4}[/tex] = 3[tex]\frac{3}{4}[/tex] = 3,75
c) 2 [tex]\frac{1}{4} * \frac{20}{27} = \frac{1+2*4}{4} * \frac{20}{27} =\frac{9}{4} * \frac{20}{27} =\frac{9*20}{4*27} = \frac{180}{108} = \frac{5*36}{3*36} = \frac{5}{3} = \frac{1*3+2}{3} =1 \frac{2}{3}[/tex]≈1,6666666
d) [tex]\frac{7}{25} * 4 \frac{1}{6} = \frac{7}{25} * \frac{1+4*6}{6} =\frac{7}{25} * \frac{25}{6} =\frac{175}{150} = \frac{7*25}{6*25} = \frac{7}{6} = 1\frac{7}{6}[/tex]≈1,166666
e) 2 [tex]\frac{2}{7} * \frac{21}{32} = \frac{2+2*7}{7} * \frac{21}{32} = \frac{16}{7} * \frac{21}{32} = \frac{1336}{224} = \frac{3*112}{2*112} = \frac{3}{2} = 1 \frac{1}{2}[/tex] = 1,5
f) [tex]\frac{16}{27} *5 \frac{5}{8} = \frac{16}{27} * \frac{5+5*8}{8} = \frac{16}{27} * \frac{45}{8} = \frac{720}{216} = \frac{10*72}{3*72} = \frac{10}{3} = \frac{3*3+1}{3} = 3 \frac{1}{3}[/tex] ≈ 3,33333
