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a=(1/√2+√3 + 1/√3+√4 + 1/√4+√5)(√5+√2)

Răspuns :

A=[(√2-√3)/(2-3)+1/(√3+2)+1/(2+√5)](√5+√2)
A=[(√2-√3)/(-1)+(√3-2)/(3-4)+(2-√5)/(4-5)](√5+√2)
A=[√3-√2+(√3-2)/(-1)+(2-√5)/(-1)](√5+√2)
A=(√3-√2+2-√3+√5-2)(√5+√2)
A=(√5-√2)(√5+√2)
A=5-2
A=3