Question

(5 + √5×8 + 3 la a doua) :2

Answer 1

$(5 + \sqrt{5} \times 8 + {3}^{2}) : 2 = (5 + \sqrt{5} \times 8 + 9) : 2 = (5 + 8 \sqrt{5} + 9) : 2 = (14 + 8 \sqrt{5}) : 2 = (14 + 8 \sqrt{5}) \times \frac{1}{2} = \frac{14 + 8 \sqrt{5} }{2} = \frac{2(7 + 4 \sqrt{5}) }{2} = 7 + 4 \sqrt{5}$