A=
[tex] \frac{8}{7} \times 5 = \frac{8}{7} \times \frac{5}{1} = \frac{8 \times 5}{7 \times 1} = \frac{40}{7} [/tex]
B=
[tex] \frac{ - 7}{4} \times 11 = \frac{ - 7}{4} \times \frac{11}{1} = \frac{ - 7 \times 11}{4 \times 1} = \frac{ - 77}{4} [/tex]
C=
[tex]3 \times \frac{6}{7} = \frac{3}{1} \times \frac{6}{7} = \frac{3 \times 6}{1 \times 7} = \frac{18}{7} [/tex]
