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chelseadiena
@chelseadiena
January 2021
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Bonsoir vous pouvez m'aider SVP
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anylor
Verified answer
Bonsoir
1)
S= 7√63 - 3√28 +√7
= 7√( 3x3x7) -3√(7x2x2) +√7
3x7√7 -3x2√7 +√7 = 21√7 -6√7+√7
on met √7 en facteur
√7( 21 -6+1) =√7 ( 16)
= 16√7 forme a√b avec a =16 et b =7
2)
√A= 13√31
A = (√A) ² = (13√31)²
= 13 x13 x√31 x√31
= 13² x31
A =5239
0 votes
Thanks 1
chelseadiena
merci
anylor
de rien, bonne journée
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Verified answer
Bonsoir1)
S= 7√63 - 3√28 +√7
= 7√( 3x3x7) -3√(7x2x2) +√7
3x7√7 -3x2√7 +√7 = 21√7 -6√7+√7
on met √7 en facteur
√7( 21 -6+1) =√7 ( 16)
= 16√7 forme a√b avec a =16 et b =7
2)
√A= 13√31
A = (√A) ² = (13√31)²
= 13 x13 x√31 x√31
= 13² x31
A =5239