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Teffynhaah
@Teffynhaah
August 2019
1
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Galeraaaa me ajuda♥
por favor♥
Não consigo entender
valendo 30 ptos♥
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LindoioSS
Utilizando a lei dos cossenos:
10^2=7^2 + x^2 -2.7.x.cos(60°)
100=49 + x^2 - 7x
x^2-7x-51=0
x'=(7+ √(49+204))÷2
x'= (7 + √253)÷2
x''= (7 - √253)÷2
espero ter ajudado.
2 votes
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Lista de comentários
10^2=7^2 + x^2 -2.7.x.cos(60°)
100=49 + x^2 - 7x
x^2-7x-51=0
x'=(7+ √(49+204))÷2
x'= (7 + √253)÷2
x''= (7 - √253)÷2
espero ter ajudado.