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Mag6
@Mag6
May 2019
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Bonjour je dois corriger un exercice auquel j'ai eu tout faux, pouvez vous m'aider svp? (ex 3)
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Bonjour,
1) P = 2(AB+BC)
24 = 2(5+BC)
24 = 10+2BC
24-10 = 2BC
14 = 2BC
BC = 7cm
2) BC = (24-2x)/2 = 12-x
3a) A = x(12-x) = 12x-x²
f(x) = -x²+12x
b) f(4) = -(4)²+12*4 = -16+48 = 32
pour x = 4cm, A = 32cm²
c) -(3)²+(12*3) = -9+36 = 27
pour x = 3cm, A = 27cm²
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Verified answer
Bonjour,1) P = 2(AB+BC)
24 = 2(5+BC)
24 = 10+2BC
24-10 = 2BC
14 = 2BC
BC = 7cm
2) BC = (24-2x)/2 = 12-x
3a) A = x(12-x) = 12x-x²
f(x) = -x²+12x
b) f(4) = -(4)²+12*4 = -16+48 = 32
pour x = 4cm, A = 32cm²
c) -(3)²+(12*3) = -9+36 = 27
pour x = 3cm, A = 27cm²