Bonjour !
Développer :
1)=>(V5-V2)² = (V5)²+(V2)²-2(V5-V2)
= 5+2-2V10 = 7-2V10
2)=>(V3+V7)² = (V3)²(V7)²+2(V3.V7)
= 3+7+2V21 = 10+2V21
3) (3V2-2V3)²
= 3²x(V2)²+2²x(V3)²- 2(3V2x2V3)
= 9x2 + 4x3-2x6V6 = 18+12-2(6V6)
= 30-12V6
Bonne journée
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Bonjour !
Développer :
1)=>(V5-V2)² = (V5)²+(V2)²-2(V5-V2)
= 5+2-2V10 = 7-2V10
2)=>(V3+V7)² = (V3)²(V7)²+2(V3.V7)
= 3+7+2V21 = 10+2V21
3) (3V2-2V3)²
= 3²x(V2)²+2²x(V3)²- 2(3V2x2V3)
= 9x2 + 4x3-2x6V6 = 18+12-2(6V6)
= 30-12V6
Bonne journée