soient: f:x -> 5x-1, g:x -> 4x et h:x -> 1/3x+5 ex: f(5)=24 g(2)=... h(6)=... g(....)=15 h(....)=9 f(....)=34 h(....)=15 f(....)=19 g(...

g(2)=4*2=8
h(6)=(1/3)*6+5=7
g(x)=15 ===> 4x=15 <==> x=15/4
h(x)=9 ===> 1/3x+5=9 <==> 1/3x=4 <==> x=3*4=12
f(x)=34 ===> 5x-1=34 <==> 5x=35 <==> x=35/5=7
h(x)=15 ===> 1/3x+5=15 <==>1/3x=10 <==> x=3*10=30
f(x)=19 ===> 5x-1=19 <==> 5x=20 <==> x=20/5=4
g(x)=2 ===> 1/3x+5=20 <==> 1/3x=15 <==> x=3*15=45