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ihssmarokiinaa94
@ihssmarokiinaa94
June 2021
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besoin d'aide dm <3
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isapaul
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Bonjour
1b)
si x= 3.7 cm
Aire MNPQ = (10 - (2*3.7))(10 - (2*3.7)) = 2.6² = 6.76 cm²
Périmètre MNPQ = 4(10 - 2(3.7) = 4 * 2.6 = 10.4 cm
c)
puisque MN = AB - 2x alors 0 < x < 5
d)
MN = AB - 2x
Périmètre = 4 * MN = 4(AB - 2x) = 4(10 - 2x) = 40 - 8x
2)
Aire MNPQ = 16 revient à
(10-2x)² = 16
(10-2x)² - 16 = 0
(10-2x)² - 4² = 0
(10 - 2x - 4)(10 - 2x + 4) = 0
(6-2x)(14 - 2x) = 0
soit x = -6/-2 = 3 soit x = -14/-2 = 7
3)
Périmètre MNPQ = 22
40 - 8x = 22
40-22 = 8x
x = 18/8 = 9/4 = 2.25 cm
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cc je n'y arrive pas du tt G besoin de vous <3 merci d avance kiiss :-*
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Lista de comentários
Verified answer
Bonjour1b)
si x= 3.7 cm
Aire MNPQ = (10 - (2*3.7))(10 - (2*3.7)) = 2.6² = 6.76 cm²
Périmètre MNPQ = 4(10 - 2(3.7) = 4 * 2.6 = 10.4 cm
c)
puisque MN = AB - 2x alors 0 < x < 5
d)
MN = AB - 2x
Périmètre = 4 * MN = 4(AB - 2x) = 4(10 - 2x) = 40 - 8x
2)
Aire MNPQ = 16 revient à
(10-2x)² = 16
(10-2x)² - 16 = 0
(10-2x)² - 4² = 0
(10 - 2x - 4)(10 - 2x + 4) = 0
(6-2x)(14 - 2x) = 0
soit x = -6/-2 = 3 soit x = -14/-2 = 7
3)
Périmètre MNPQ = 22
40 - 8x = 22
40-22 = 8x
x = 18/8 = 9/4 = 2.25 cm