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Sagot :

[tex] a. \: \frac{5}{7} \times \frac{2}{3} = \frac{5 \times 2}{7 \times 3 } = \frac{10}{21} [/tex]

[tex]b. \: \frac{9}{11} \times \frac{8}{7} = \frac{9 \times 8}{11\times 7 } = \frac{72}{77} [/tex]

[tex] c. \: \frac{45}{7} \times \frac{2}{9} = \frac{45 \times 2}{7 \times 9 } = \frac{90}{63} [/tex]

[tex]d. \: \frac{6}{7} \times \frac{1}{13} = \frac{6\times 1}{7 \times 13 } = \frac{6}{91} [/tex]

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