Question

(5√72-2√18+3√32)÷√8=?
Repedeee!!

Answer 1

= (5√36·√2 - 2√9 ·√2 + 3√16·√2 ) : √4·√2 = 
          termenii se scriu ca patrate 
= ( 5 · 6 ·√2  - 2 ·3 ·√2 + 3· 4 ·√2) : 2 √2 = 
= ( 30   -  6 + 12 ) ·√2 :√2 :2 =
                               ↓
                              = 1 
= 36 : 2 =18

Answer 2

$(5 \sqrt{72} -2 \sqrt{18} +3 \sqrt{32} ): \sqrt{8} =(5*6 \sqrt{2} -2*3 \sqrt{2} +3*4 \sqrt{2} ):2 \sqrt{2} = \\ =(30 \sqrt{2} -6 \sqrt{2} +12 \sqrt{2} ):2 \sqrt{2} =36 \sqrt{2} :2 \sqrt{2} =18$