Bonjour,aidez moi je vous en supplie !!! a) 3/2 x 4/7-9/7x1/2 b )3/4+7/4x5/3+1/3 c) (3/5-3/25)x5/4+1 merci beaucoup !!!!!!!!! P.S : je vous met meilleur réponse

Bonjour,

a) 3/2 x 4/7-9/7x1/2
= 12/14 - 9/14
= 3/14

b )3/4+7/4x5/3+1/3
= 3/4 + 35/12 + 1/3
= 3 x 3 / 4 x 3 + 35/12 + 1 x 4 / 3 x 4
= 9/12 + 35/12 + 4/12
= 48/12
= 12 x 4 / 12 x 1
= 4

c) (3/5-3/25)x5/4+1
= (3 x 5 / 5 x 5 - 3/25) x 5/4 + 1
= (15/25 - 3/25) x 5/4 + 1
= 12/25 x 5/4 + 1
= 60/100 + 1
= 20 x 3 / 20 x 5 + 1
= 3/5 + 1
= 3/5 + 1 x 5 / 1 x 5
= 3/5 + 5/5
= 8/5

Bonjour,

A. 3/2 x 4/7 - 9/7 x 1/2.
= 12/14 - 9/14.
= 3/14.

B. 3/4 + 7/4 x 5/3 + 1/3.
= 3/4 + 35/12 + 1/3.
= 3x3/4x3 + 35/12 + 1x4/3x4.
= 9/12 + 35/12 + 4/12.
= 48/12.
= 4.

C. (3/5 - 3/25) x 5/4 + 1.
= (3x5/5x5 - 3/25) x 5/4 + 1.
= (15/25 - 3/25) x 5/4 + 1.
= 12/25 x 5/4 + 1.
= 60/100 + 1.
= 60/100 + 1x100/1x100.
= 60/100 + 100/100.
= 160/100.
= 1,6.