Bonjour pouvez vous m’aidez pour l’ex sur les fractions svp?

bonjour

A = ( 2/3 - 9 /10 ) : ( 2 - 3 /5 )

A = ( 20/30 - 27/30 ) : ( 10/5 - 3 /5 )

A = - 7/30  : 7/5

A = - 7/30 x 5/7

A = - 35/210 = - 1/6

B = 4/5 + 6/5 : ( 32/45 x 27/48 - 2 /3 )

B = 4/5 + 6 /5 : (864/2160 - 2 /3 )

B =  4/5 + 6 /5 : (  2/5  - 2/3)

B = 4/5 + 6 /5 : ( 6/15 - 10/15)

B = 4/5 + 6/5 : - 4 /15

B = 4/5 + 6/5 x - 15/4

B = 4/5 - 90/20

B = 16/20 - 90/20

B = - 74/20 =  - 37/10

Bonjour,

A=

2/3 -9/10 =

20/30 - 27/30 = -7/30

2-3/5 =

10/5 - 2/5 = 8/5

-7/30 * 5/8 = -35/240

= -7/48

B=

32/45 * 37/48 = 1184/ 2160 =148/270 = 74/135    

74/135 - 2/3 = 74/135/ - 90/135 = - 16/135

6/5 / -16/35 = 6/5* -35/16 = -210/80 = -21/8

4/5 - 21/8 =

32/40  -105/40 = -73/40