bonsoir,

S=

5/2*5/5 -7/10 +1/5 *2/2

= 25/10 -7/10+2/10

= 18/10+2/10

= 20/10

= 2

T =

9/7*2/2 +3/14-2*14/14

= 18/14+3/14-28/14

= 21/14 -28/14

= -7/14

= -1/2

= -0,5

U =

16/16 -7/16-1/2*8/8

= 16/16 -7/16 -8/16

= 9/16 -8/16

= 1/16

V=

7/2*3/3 -5/6 -5/3*2/2

= 21/6 -5/6 -10/6

= 16/6 - 10/6

= 6/6

= 1

Réponse :

S=5/2 - 7/10 + 1/5

S=5x5/2x5 - 7/10 + 1x2/5x2

S=25/10 - 7/10 + 2/10

S=20/10

S=2

T=9/7 + 3/14 - 2

T=9x2/7x2 + 3/14 - 28/14

T=18/14 + 3/14 - 28/14

T=-7/14

T=-1/2

T=-0,5

U=1 - 7/16 - 1/2

U=16/16 - 7/16 - 1x8/2x8

U=16/16 - 7/16 - 8/16

U=1/16

U=0,0625

V=7/2 - 5/6 - 5/3

V=7x3/2x3 - 5/6 - 5x2/3x2

V=21/6 - 5/6 - 10/6

V=6/6

V=1

("/" veut dire la barre de fraction)