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Fomathieu7
@Fomathieu7
May 2019
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Aidez moi svp calculer en donnant le resultat sous forme de fraction:
B=4/7_3+7/4
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Bonsoir.
3 = 3/1
Donc 4/7 + 3/1 + 7/4
Je réduis au même dénominateur :
DC = 7 × 1 × 4 = 28
4/7 = 4/7 × 1 × 4 = 16/28
7/4 = 7/4 × 1 × 4 = 28/28
3/1 = 3/1 × 4 × 7 = 84/28
Donc nous additionnons :
84 + 28 + 16 = 128/28 = ( 32 × 4 ) / ( 7 × 4 ) = 32/7
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3 = 3/1
Donc 4/7 + 3/1 + 7/4
Je réduis au même dénominateur :
DC = 7 × 1 × 4 = 28
4/7 = 4/7 × 1 × 4 = 16/28
7/4 = 7/4 × 1 × 4 = 28/28
3/1 = 3/1 × 4 × 7 = 84/28
Donc nous additionnons :
84 + 28 + 16 = 128/28 = ( 32 × 4 ) / ( 7 × 4 ) = 32/7