Explicație pas cu pas:
a)4(radical 5 - 2 radical 2 ) + 3(7 radical 5 - 4 radial 2 ) -7( radical 2 - 3 radical 5)
=4 radical 5 - 8 radical 2 + 21 radical 5 - 12 radical 2 -7 radical 2 + 21 radical 5
=46 radical 5 -27 radical 2
