Question

Efetue :
a)√20+√45=
b)√50+√38-√72=
c)3√12+√75+2√108=

Answer 1

√20 = √4.5 = 2√5
√45 = √9.5 = 3√5
√50 = √25.2 = 5√2
√38 = √38
√72 = √36.2 = 6√2
√12 = √4.3 = 2√3
√75 = √25.3 = 5√3
√108 = √36.3 = 6√3

Substituindo todas:

a) 2√5 + 3√5 = 5√5
b) 5√2 + √38 - 6√2 = -√2 + √38
c) 3(2√3) + 5√3 + 2(6√3) = 6√3 + 5√3 + 12√3 = 23√3