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Berga123
@Berga123
May 2019
1
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J'ai aussi un autre exercice :
effectuer les calculs suivants en déraillant les étapes et en donnant le résulta sous forme fractionnaire la plus simple possible
1) 3/8 - 3/8 x 7/5
2) -4/9 x ( 15/11 - 3 )
3) -9/10 x 7/2 + 3/8 x21/5
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maudmarine
Verified answer
Bonjour,
1) 3/8 - 3/8 x 7/5
= 3/8 - 21/40
= 3 x 5 / 8 x 5 - 21/40
= 15/40 - 21/40
= - 6/40
= 2 x - 3 / 2 x 20
= - 3/20
2) -4/9 x ( 15/11 - 3 )
= - 4/9 x (15/11 - 3 x 11 / 1 x 11)
= - 4/9 x (15/11 - 33/11)
= - 4/9 x - 18/11
= 72/99
= 9 x 8 / 9 x 11
= 8/11
3) -9/10 x 7/2 + 3/8 x 21/5
= - 63/20 + 63/40
= - 63 x 2 / 20 x 2 + 63/40
= - 126/40 + 63/40
= - 63/40
1 votes
Thanks 0
berga123
ok merci
berga123
desole moin long a cette exo
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Lista de comentários
Verified answer
Bonjour,1) 3/8 - 3/8 x 7/5
= 3/8 - 21/40
= 3 x 5 / 8 x 5 - 21/40
= 15/40 - 21/40
= - 6/40
= 2 x - 3 / 2 x 20
= - 3/20
2) -4/9 x ( 15/11 - 3 )
= - 4/9 x (15/11 - 3 x 11 / 1 x 11)
= - 4/9 x (15/11 - 33/11)
= - 4/9 x - 18/11
= 72/99
= 9 x 8 / 9 x 11
= 8/11
3) -9/10 x 7/2 + 3/8 x 21/5
= - 63/20 + 63/40
= - 63 x 2 / 20 x 2 + 63/40
= - 126/40 + 63/40
= - 63/40