Réponse :
bonjour
A =(1/2+7/8)×8/11=
(4/8+7/8)×8/11=
11/8×8/11=1
B
2-8/3×8/5=
2-64/15=
30/15-64/15=-34/15
C=16/5÷8/15=
16/5×15/8=
240/40=6
D=-7/-8-5/8×5=
-7/-8-25/8=
7/8-25/8=-18/8=-9/4
E= 2-4/5+1/3=
30/15-12/15+5/15=23/15
2+4/5+1/3=
30/15+12/15+5/15=47/15
et 23/15÷47/15=
23/15×15/47=345/705=23/47
Explications étape par étape
A = ( 1/2 + 7/8) x 8 /11
= ( 4/8 + 7/8) x 8 /11
= 11/8 x 8/11
= 88/88 = 1
B = 2 - 8/3 x 8/5
= 2 - 64/15
= 30/15 - 64/15
= - 34/15
C = 16/5 : 8/15
= 16/5 x 15/8
= 240/40
= 6
D = - 7/ - 8 - 5/8 x 5
= 7/8 - 25 /8
= - 18/8
= - 9/4
E = ( 2 - 4/5 + 1/3) : ( 2 + 4/5 + 1 /3 )
= ( 30/15 - 12/15 + 5/15) : ( 30/15 + 12/15 + 5/15)
= 23/15 : 47/15
= 23/15 x 15/47
= 345/705
= 23/47
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Réponse :
bonjour
A =(1/2+7/8)×8/11=
(4/8+7/8)×8/11=
11/8×8/11=1
B
2-8/3×8/5=
2-64/15=
30/15-64/15=-34/15
C=16/5÷8/15=
16/5×15/8=
240/40=6
D=-7/-8-5/8×5=
-7/-8-25/8=
7/8-25/8=-18/8=-9/4
E= 2-4/5+1/3=
30/15-12/15+5/15=23/15
2+4/5+1/3=
30/15+12/15+5/15=47/15
et 23/15÷47/15=
23/15×15/47=345/705=23/47
Explications étape par étape
bonjour
A = ( 1/2 + 7/8) x 8 /11
= ( 4/8 + 7/8) x 8 /11
= 11/8 x 8/11
= 88/88 = 1
B = 2 - 8/3 x 8/5
= 2 - 64/15
= 30/15 - 64/15
= - 34/15
C = 16/5 : 8/15
= 16/5 x 15/8
= 240/40
= 6
D = - 7/ - 8 - 5/8 x 5
= 7/8 - 25 /8
= - 18/8
= - 9/4
E = ( 2 - 4/5 + 1/3) : ( 2 + 4/5 + 1 /3 )
= ( 30/15 - 12/15 + 5/15) : ( 30/15 + 12/15 + 5/15)
= 23/15 : 47/15
= 23/15 x 15/47
= 345/705
= 23/47