Răspuns:
- [tex]46 \sqrt{5} - 27 \sqrt{2} [/tex]
- [tex]17 \sqrt{7} + 20 \sqrt{3} [/tex]
Explicație pas cu pas:
[tex]4 \times ( \sqrt{5} - 2 \sqrt{2} ) + 3(7 \sqrt{5} - 4 \sqrt{2} ) - 7( \sqrt{2} - 3 \sqrt{5} ) \\ = 4 \sqrt{5} - 8 \sqrt{2} + 21 \sqrt{5} - 12 \sqrt{2} - 7 \sqrt{2} + 21 \sqrt{5} \\ = 46 \sqrt{5} - 27 \sqrt{2} [/tex]
[tex] \sqrt{63} - 3(2 \sqrt{7} - 4 \sqrt{3} ) + 4(2 \sqrt{3} + 5 \sqrt{7} ) \\ = 3 \sqrt{7} - 6 \sqrt{7} + 12 \sqrt{3} + 8 \sqrt{3} + 20 \sqrt{7} \\ = 17 \sqrt{7} + 20 \sqrt{3} [/tex]
