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[tex]x(1- \sqrt{5} ) \geq 4-2 \sqrt{20} [/tex]
aflati x


Răspuns :

x(1-√5)≥ 4-2√20
x(1-√5)≥4-4√5          (√20=2√5)
x(1-√5)≥4(1-√5)⇒x≤4⇒x∈(-infinit,4]