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X:(5radical21)=2radical7
Spuneti va rog cum ati rezolvat.Multumesc


Răspuns :

x : (5√21) = 2√7

x = 2√7 · 5√21

x = 2√7 · 5·√7·√3 = 10√7 · √3= 10√21
X: 5√21=2√7
X=√5^2×21×√2^2×7
X=√525×√28
X=√14800
X=20√37