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2013-05-26T11:27:25+02:00

Ex44:
f(x) = ax

 

6a = 5
  a = 5/6

 

f(x) = 5/6 x

 

g(x) = ax

 

-4a = 8/7
    a = -2/7

 

g(x) = -2/7 x

 

h(x) = ax

 

2a/3 = 5
      a = 15/2

 

h(x) = 15/2 x

 

Ex45:

a) h(20) = 4 h(5) = 36

 

b) h(2.5) = h(5) /2 = 4.5

 

c) h(17.5) = 7 h(5) /2 = 63/2 = 31.5

 

Ex46:
a) f fonction lineaire car 0 kg de fromage coute 0 €

 

b)
masse x    0     1     2.5     3     1.6
prix f(x)       0    12    30    36   19.2

 

c) f(5) = 60 signifie le prix de 5 kg de fromage