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Sagot :

(m-1)x²-4m x+4m-1=0
delta=16m²-4(m-1)(4m-1)
       =16m²-4(4m²-5m+1)
       =16m²-16m²+20m-4
       =4(5m-1)
si m=1/5 alors delta=0
donc il y a 1 seule solution

si m>1/2 alors delta>0
donc il y a 2 solutions

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