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Calculati:
a) √3+√12+√27+√48+√147=?
b) √2+√8+√18+√32+√50+√72+√98=?
c) √5+√20+√45+√80+√125+√180+√245=?


Răspuns :

a) √3+√12+√27+√48+√147=
=√3+2√3+3√3+4√3+7√3=
=17√3

b) √2+√8+√18+√32+√50+√72+√98=
= √2+2√2+3√2+4√2+5√2+6√2+7√2=
=28√2

c) √5+√20+√45+√80+√125+√180+√245=
=√5+2√5+3√5+4√5+5√5+6√5+7√5=
=28√5