Bonjour pourriez vous m aidez pour cette exercice je vous remercie grandement d'avance l exo est en .... Pergunta de ideia deCocowater

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Bonjour,

A = 7/8 - 3/8 x 20/9
A = 7/8 - 60/72
A = (7 x 9) / (8 x 9) - 60/72
A = 63/72 - 60/72
A = 3/72
A = (3 x 1) / (3 x 24)
A = 1/24

B = (5/3 - 1/9) : (1/2 + 2/3)
B = [(5 x 3) / (3 x 3) - 1/9] : [(1 x 3 / 2 x 3) + (2 x 2) / (3 x 2)]
B = (15/9 - 1/9) : (3/6 + 4/6)
B = 14/9 : 7/6
B = 14/9 x 6/7
B = 84/63
B = (21 x 4) / (21 x 3)
B = 4/3

C = 18/25 : (- 27/15)
C = 18/25 x (- 15/27)
C = - 270/675
C = (135 x - 2) / (135 x 5)
C = - 2/5

D = Continue...

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loulakar

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Bonjour,

$A = \frac{7}{8} - \frac{3}{8} \times \frac{20}{9}$
$A = \frac{7}{8} - \frac{20}{8} \times \frac{3}{9}$
$A = \frac{7}{8} - \frac{5}{2} \times \frac{1}{3}$
$A = \frac{7}{8} - \frac{5}{6}$
$A = \frac{21}{24} - \frac{20}{24}$
$A = \frac{1}{24}$

$B = (\frac{5}{3} - \frac{1}{9}) : (\frac{1}{2} + \frac{2}{3}$
$B = (\frac{15}{9} - \frac{1}{9}) : (\frac{3}{6} + \frac{4}{6}$
$B = \frac{14}{9} : \frac{7}{6}$
$B = \frac{14}{9} \times \frac{6}{7}$
$B = \frac{14}{7} \times \frac{6}{9}$
$B = 2 \times \frac{2}{3}$
$B = \frac{4}{3}$

$C = \frac{18}{25} : \frac{-27}{15}$
$C = \frac{18}{25} \times \frac{-15}{27}$
$C = \frac{18}{27} \times \frac{-15}{25}$
$C = \frac{2}{3} \times \frac{-3}{5}$
$C = \frac{-2}{5}$

$D = \frac{36 \times 10^{-4} \times 22 \times 10^{3}}{33 \times 10^{2} \times 30 \times 10^{-3}}$
$D = \frac{36 \times 22}{33 \times 30} \times 10^{-4+3-2+3}$
$D = \frac{36 \times 2}{3 \times 30} \times 10^{0}}$
$D = \frac{12}{15}$
$D = \frac{4}{5}$

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Pourriez vous m'aidez merci d'avance niveau 3eme

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