Răspunsuri

2014-09-26T18:16:32+03:00
A={x∈Z/  \frac{-5}{4-x} ∈N}
 \frac{-5}{4-x} ∈N⇒  \frac{-5}{4-x
} = 1 sau 5
Pentru  \frac{-5}{4-x} =1⇒ 4-x=-5
x= 9
Pentru  \frac{-5}{4-x} =5⇒ 20-5x=-5
-5x=-25
5x=25
x=5
a={5,9}
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