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Sagot :

Réponse:

Bonsoir,

Exercice 11:

a)

[tex] \frac{3}{4} \times \frac{1}{7} = \frac{3 \times 1}{4 \times 7} = \frac{3}{28} [/tex]

b)

[tex]3 \times \frac{3}{2} = \frac{3 \times 3}{2} = \frac{9}{2} [/tex]

c)

[tex]\frac{2}{3} \times \frac{3}{5} = \frac{2 \times 3}{3 \times 5} = \frac{2}{5} [/tex]

Exercice 12:

a)

[tex]\frac{8}{3} \times \frac{3}{12} = \frac{8 \times 3}{3 \times 12} = \frac{24}{36} = \frac{2}{3}[/tex]

b)

[tex]\frac{18}{3} \div 9 = \frac{ \frac{18}{3} }{9} = \frac{18}{3} \times \frac{1}{9} = \frac{18}{3 \times 9} = \frac{2}{3}[/tex]

c)

[tex] 3 \times \frac{6}{4} = \frac{3 \times 6}{4} = \frac{18}{4} = \frac{9}{2} [/tex]

N'hésite pas à poser des questions si besoin

Réponse:

a)

[tex] \frac{ \frac{3}{4} }{7} = \frac{3}{4} \times \frac{1}{7} = \frac{3}{28} [/tex]

b)

[tex] \frac{3}{ \frac{2}{3} } = \frac{3 \times 3}{2} = \frac{9}{2} [/tex]

c)

[tex] \frac{ \frac{2}{3} }{ \frac{5}{3} } = \frac{2 \times 3}{3 \times 5} = \frac{6}{15} [/tex]

exercice 12

a)

[tex] \frac{8}{3} \times \frac{3}{12} = \frac{4 \times 2}{4 \times 3} = \frac{2}{3} [/tex]

b)

[tex] \frac{18}{3 \times 9} = \frac{9 \times 3}{3 \times 9} = \frac{1}{1} [/tex]

c)

[tex] \frac{1}{3} \times \frac{4}{6} = \frac{2 \times 2}{3 \times 2 \times 3} = \frac{2}{9} [/tex]

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