wyznacz dziedzinę funkcji f, jeśli:
f(x)= 3-5/2x+5
2x+5≠0
2x≠-5 /:2
x≠-2.5
D=R\{-2.5}
3-5
F(x)=-------- Df;x∈R\{-2,5}
2x+5
2x+5=0
2x=-5|:2
x=-2,5
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2x+5≠0
2x≠-5 /:2
x≠-2.5
D=R\{-2.5}
3-5
F(x)=-------- Df;x∈R\{-2,5}
2x+5
2x+5=0
2x=-5|:2
x=-2,5