Bonjour je n'arrive pas a faire mes 2 exercices help me please!

N°1 Calculer en donnant le résultat en écriture fractionnaire
A = 19/100+-26/100+51/100
B = 1/2+1/3+1/5
C= 5/10+48/-100--3/10
D= -1/3-4/5+7/-2
E= 1/2+2/3+5/6
F= 2/-3-1/-4-/-3/-2
G= -4/3-1/-6+-7/-12
H= -1/2-2/-3+-3/-4--4/5

N°2
A=4/7-(6/7-5/7)+1/7
B=14/30-(-1/6-1/-5)
C=19/4-[1/2-(3/8-1/4)]
D=24/15-[--2/3-(11/-5-2)]
E=(7/12-1/6)-(3/4-1/3)
F=(--75/10-3)-(5-43/-10)
G=3/10-(97/100-0,8)
H=-(-25/42-2/-7)-5/3

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Meilleure réponse !
2013-11-24T13:06:02+01:00
N°1 Calculer en donnant le résultat en écriture fractionnaire 
A = 19/100+-26/100+51/100
=19/100-26/100+51/100
=44/100
=22/50

 B = 1/2+1/3+1/5 
=15/30+10/30+6/30
=31/30

C= 5/10+48/-100--3/10 
=50/100-48/100+30/100
=32/100
=16/50

D= -1/3-4/5+7/-2
=-10/30-24/30-105/30
=-139/30

E= 1/2+2/3+5/6 
=3/6+4/6+5/6
=12/6
=2

F= 2/-3-1/-4--3/-2
=-8/12+3/12-18/12
=-13/12

G= -4/3-1/-6+-7/-12
=-16/12+2/12+7/12
=-7/12

H= -1/2-2/-3+-3/-4--4/5 
=-30/60+40/60+45/60+48/60
=103/60

N°2 
A=4/7-(6/7-5/7)+1/7 
=4/7-6/7+5/7+1/7
=4/7

B=14/30-(-1/6-1/-5) 
=14/30-(-5/30+6/30)
=14/30+5/30-6/30
=13/30

C=19/4-[1/2-(3/8-1/4)] 
=19/4-(1/2-(3/8-2/8))
=19/4-(2/4-1/8)
=38/8-4/8+1/8
=35/8

D=24/15-[--2/3-(11/-5-2)] 
=24/15-(2/3-(-11/5-10/5))
=24/15-(2/3-21/5)
=24/15-(10/15-63/15)
=24/15-(-53/15)
=24/15+53/15
=77/15

E=(7/12-1/6)-(3/4-1/3)
=(7/12-2/12)-(9/12-4/12)
=5/12-5/12
=0
 
F=(--75/10-3)-(5-43/-10) 
=(75/10-30/10)-(50/10+43/10)
=45/10-7/10
=38/10

G=3/10-(97/100-0,8) 
=3/10-(97/100-8/10)
=30/100-(97/100-80/100)
=30/100-17/100
=13/100

H=-(-25/42-2/-7)-5/3 
=-(-25/42+12/42)-70/42
=-(-13/42)-70/42
=13/42-70/42
=57/42
=19/14