Question

va rog ajutatima dau coroana

Answer 1

1)

$2 \sqrt{3} - 5 \sqrt{3} = - 3 \sqrt{3}$

2)

$- 4 \sqrt{7} + 10 \sqrt{7} = 6 \sqrt{7}$

3)

$- 10 \sqrt{2} - 15 \sqrt{2} = - 25 \sqrt{2}$

4)

$( + 3 \sqrt{5} ) + ( - 4 \sqrt{5} ) =$

$= 3 \sqrt{5} - 4 \sqrt{5} = - 1 \sqrt{5}$

5)

$( - 7 \sqrt{7} ) - ( + 10 \sqrt{7} ) =$

$= - 7 \sqrt{7} - 10 \sqrt{7} = - 17 \sqrt{7}$

6)

$3 \sqrt{2} - 7 \sqrt{6} + 5 \sqrt{6} - 10 \sqrt{2} =$

$= - 7 \sqrt{2} - 2 \sqrt{6}$

7)

$12 \sqrt{8} - 7 \sqrt{32} =$

$= 12 \sqrt{ {2}^{2} \times 2 } - 7 \sqrt{ {4}^{2} \times 2 } =$

$= 12 \times 2 \sqrt{2} - 7 \times 4 \sqrt{2} =$

$= 24 \sqrt{2} - 28 \sqrt{2} = - 4 \sqrt{2}$