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Sagot :

T= -8rac(6) + 28rac(6) = 20rac(6)
T = -4 sqrt 24 + 7 sqrt96
T = -4 sqrt(4*6) + 7 sqrt(6*16)
T =  -4 * 2 sqrt6 + 7*4*sqrt6
T =2sqrt6 (-4 +14)
T= 20 sqrt6

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