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matthieu62320
@matthieu62320
June 2021
2
169
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calculer
3/7 - 2/7 * 21/8
écrire le résultat sous la forme d une fraction irréductible
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cam912
3/7-2/7*21/8=3/7-2*21/7*8=3/7-42/56=3/7-3/4=3*4/7*4-3*7/4*7=12/28-21/28=-9/28
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Thanks 0
MMC
Attention c'est -9/28
cam912
ouai s'est vrai je l'ai oublier dsl
matthieu62320
merci
nathalienouts
3/7 -2/7x21/8
= 3/7 -2x21/7x8
= 3/7-2x3x7/7x2x4
= 3/7 - 3/4
= 3x4/7x4-3x7/4x7
= 12/28-21/28
= -9/28
1 votes
Thanks 1
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= 3/7 -2x21/7x8
= 3/7-2x3x7/7x2x4
= 3/7 - 3/4
= 3x4/7x4-3x7/4x7
= 12/28-21/28
= -9/28