Răspuns
Explicație pas cu pas:
a) 5√6 / 2√20 = 5√6 / ( 2 × 2√5 ) = (5√6×√5 )/(4×5) = √30 / 4
b) - 3√7 / 2√12 = - 3√7 / ( 2×2√3) = ( - 3√7×√3) /(4×3)= - √21 / 4
c) ( 1 - √5) / √45 = (1 - √5) / 3√5= √5(1 - √5) /(3×5)=(√5 - 5 ) / 15
d) ( √2 - √5) / 3√27 =
= ( √2 - √5) / ( 3 × 3√3 ) =
= √3 ( √2 - √5) / ( 9 × 3 ) =
= ( √6 - √15 ) / 27
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e) 5√11 / 2√44 = 5√11 / ( 2 × √4 × √11) = 5 / (2×2 ) = 5 / 4