Bonjour j'ai besoins d'aide svp Exercice 1 : Isoler a, b, c, d. a       c ---  =  --- b       d ----------------------------------------------------------------

Réponse :

Explications étape par étape

Bonjour

Exercice 1 : Isoler a, b, c, d.

a c

--- = ---

b d

a = b x c / d

a = bc / d

b = ad / c

c = ad / b

d = bc / a

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Exercice 2 : Isoler a,b,c,d,e,f,g,h

ab ef

---- = ----

cd gh

a = cdef / bgh

b = cdef / agh

c = abgh / def

d = abgh / cef

e = abgh / cdf

f = abgh / cde

g = cdef / abh

h = cdef / abg

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Exercice 3 : Isoler a,b,c,d,e,f,g,h

a+b e+f

----- = -----

c+d g+h

a + b = (e + f)(c + d) / (g + h)

a = (e + f)(c + d) / (g + h) - b

b = (e + f)(c + d) / (g + h) - a

c + d = (a + b)(g + h) / (e + f)

c = (a + b)(g + h) / (e + f) - d

d = (a + b)(g + h) / (e + f) - c

e + f = (a + b)(g + h) / (c + d)

e = (a + b)(g + h) / (c + d) - f

f = (a + b)(g + h) / (c + d) - e

g + h = (e + f)(c + d) / (a + b)

g = (e + f)(c + d) / (a + b) - h

h = (e + f)(c + d) / (a + b) - g