Bonjour,
2√8 = 2√(4×2) = 2√(2²×2) = 2×2√2 = 4√2
√32 = √(16×2) = √(4²×2) = 4√2
√72 = √(36×2) = √(6²×2) = 6√2
donc : 2√8 - √32 + √72 = 4√2 - 4√2 + 6√2 = 6√2
Bonjour !
2V8-V32+V72
2V4×2 - V16×2+V36×2
4V2 - 4V2 + 6V2 = 6V2
Bon courage.
