Question

hai va rog mult.....​

Answer 1

Răspuns:

a)

$2 \sqrt{11} + 7 \sqrt{11} - 11 \sqrt{11} + \sqrt{11} =$

$2 \sqrt{11} + 7 \sqrt{11} - 11 \sqrt{11} + 1 \sqrt{11} =$

$(2 + 7 - 11 + 1) \sqrt{11} =$

$- 1 \sqrt{11} =$

$- \sqrt{11}$

b)

$7 \sqrt{20} + 3 \sqrt{125} - 4 \sqrt{80} =$

$14 \sqrt{5} + 3 \sqrt{125} - 4 \sqrt{80} =$

$14 \sqrt{5} + 15 \sqrt{5} - 4 \sqrt{80}$

$14 \sqrt{5} + 15 \sqrt{5} - 16 \sqrt{5} =$

$13 \sqrt{5}$