Calculer les expressions suivantes A= 7/3-4/3+8/5 B=-4/9x1/5+3/7 C= -8/3+-5/6+7/4 Se qui peuvent m’aider svp

Bonsoir,

A= 7/3-4/3+8/5=

35/15 -20/15 +24/15 = 39/15 = 13/5

B=-4/9x1/5+3/7=

-4/45 +3/7=  -28/315 + 135/315 =  107/315

C= -8/3+-5/6+7/4=

-64/24 - 20/24 + 42/24 = -42/24 = -21/12 = -7/4

A= 7/3 - 4/3 +8/5

A= 7*5/3*5 - 4*5/3*5 + 8*3/5*3

A= 35/15 - 20/15 + 24/15

A= 39/15 = 13/5

B= -4/9*1/5+3/7

B= -4/45 + 3/7

B= -4*7/45*7 + 3*45/7*45

B= -28/315 + 135/315

B= 107/315

C= -8/3+-5/6+7/4

C= -8*4/3*4 - 5*2/6*2 + 7*3/4*3

C= -32/12 -10/12 + 21/12

C= -21/12 = -7/4

J ESPERE T'AVOIR AIDER