bonsoir
C = 1 : ( 1/3 + 1/5)
C = 1 : ( 5/15 + 3/15)
C = 1 : 8/15
C = 1 x 15/8 = 15/8
D = ( 36/5 + 1) : ( 63/ 6 + 1)
D = ( 36/5 + 5/5 ) : ( 63/6 + 6/6)
D = 41/5 : 69/6
D = 41/5 x 6/69 = 246/345 = 82/115
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Verified answer
bonsoir
C = 1 : ( 1/3 + 1/5)
C = 1 : ( 5/15 + 3/15)
C = 1 : 8/15
C = 1 x 15/8 = 15/8
D = ( 36/5 + 1) : ( 63/ 6 + 1)
D = ( 36/5 + 5/5 ) : ( 63/6 + 6/6)
D = 41/5 : 69/6
D = 41/5 x 6/69 = 246/345 = 82/115
Verified answer
Bonsoir,• C = 1/( 1/3 + 1/5 )
On effectue d'abord l'addition du bas :
1/3 + 1/5
On réduit au même dénominateur :
1/3 = ( 1 × 5 ) / ( 3 × 5 ) = 5/15
1/5 = ( 1 × 3 ) / ( 5 × 3 ) = 3/15
5/15 + 3/15 = 8/15
C = 1 ÷ 8/15
→ 1 × 15/8 = 15/8
• D = ( 4/5 × 9 + 1 ) / ( 7/6 × 9 + 1 )
On effectue d'abord l'opération du haut :
→ 4/5 × 9 + 1 = 36/5 + 5/5 = 41/5
Puis celle du bas :
→ 7/6 × 9 + 1 = 63/6 + 6/6 = 69/6 = ( 69 ÷ 3 ) / ( 6 ÷ 3 ) = 23/2
D = 41/5 ÷ 21/2 = 41/5 × 2/23 = 82/115
Bonne soirée :)