Răspuns :
1. 2√8 + 3√18 + 13√ 2 = 2*2√2+3*3√2-13√2=4√2+9√2-13√2=0
2 . √2 ( √2 + √3 ) - √3 ( 2√3 + √2 ) = 2+√2√3-6-√2√3 = -4
3 . ( √5 - √2 )² + 2√2( √5 - √2 ) =5-2√5√2 + 2 +2√5√2-4 =3
2 . √2 ( √2 + √3 ) - √3 ( 2√3 + √2 ) = 2+√2√3-6-√2√3 = -4
3 . ( √5 - √2 )² + 2√2( √5 - √2 ) =5-2√5√2 + 2 +2√5√2-4 =3
1) 2√8+3√18-13√2=
=2x2√2+3x3√2-13√2=4√2+9√2-13√2=0
2)√4+√6-2√9-√9=√4+√6-3√9
3)5-2+2√10-2√4=2√10-2√4+3