x = 5 : 2(125) + 8(25) = 250 + 200 = 450
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- x = 6.0 â 2Ã216 + 8Ã36 = 432 + 288 = 720 â trop
- Wait â erreur dans volume : 2x²(x+4) = 2x³ + 8x² = 384
- Essay x = 4 : 2(64) + 8(16) = 128 + 128 = 256
- x = 3 : 2(27) + 8(9) = 54 + 72 = 126
- x = 4.5 : 2(91.125) + 8(20.25) = 182.25 + 162 = 344.25
- x = 4.8 : 2(110.592) + 8(23.04) = 221.184 + 184.32 = 405.5 â trop
