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Sagot :

Bonsoir,

volume pyramide:

(6*6* x ) /3 = 36x/3 = 12x

volume  PR

2*3 * (x+1)  = 6( x+1) = 6x+6

12x = 6x+6

12x-6x = 6

6x = 6

x= 6/6

x= 1

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