bonjour pourriez-vous m'aider sur cet exercice de mathématiques niv 5​​

Bonjour

Pyramide multiplicative :

………….. | A |

………..| B | C |

…| 7/12 | D …..| E |

| F ..| 7/8 | 15/7 | 4/5 |

E = 15/7 x 4/5

E = 15/5 x 4/7

E = 3 x 4/7

E = 12/7

7/12 = F x 7/8

F = 7/12 x 8/7

F = 8/12 x 7/7

F = 2/3

D = 7/8 x 15/7

D = 15/8 x 7/7

D = 15/8

B = 7/12 x 15/8

B = 15/12 x 7/8

B = 5/4 x 7/8

B = 35/32

C = 15/8 x 12/7

C = 12/8 x 15/7

C = 3/2 x 15/7

C = 45/14

A = 35/32 x 45/14

A = 1575/448

……. | 1575/448 |

…..| 35/32 | 45/14 |

…| 7/12 | 15/8 | 12/7 |

| 2/3 | 7/8 | 15/7 | 4/5 |