1. Calculer sous forme fractionnaire en précisant les étapes de calcul. A= 7/6 - 5/4 × 1/2 B= 5/9 ÷ (5/9 + 1/6) 2/ Calculer en simplifiant si possible et vérifi

Bonjour
1)
A= 7/6 - 5/4 × 1/2
A= 7/6 -5*1/4*2
A= 7/6-5/8
A= 28-15/24
A= 13/24

B= 5/9 ÷ (5/9 + 1/6)
B= 5/9 ÷ ( 10+3/18)
B= 5/9 ÷ 13/18
B= 5/9 * 18/13
B= 5*2/13
B= 10/13

2)
A= 2/7 - 3/7 × 14/9
A= 2/7 -2/3
A= 6-14/21
A= -8/21

B= -7/8 × (2/3 - 1)
B= -7/8 *(2-3/3)
B= -7/8*(-1/3)
B= 7/8*1/3
B=7/24


C= 4/5 × 1/4 + 2/5
C= 1/5+2/5
C= 1+2/5
C= 3/5

Bonsoir,

1/

A=7/6 -5/4 ×1/2

A=7/6 -(5×1)/(4×2)

A=7/6 -5/8

A=(7×8)/(6×8) - (5×6)/(8×6)

A=56/48 - 30/48

A=26/48

A=13/24

bon courage !