Tolong dong smua soal

Tolong dong smua soal

Jawaban:

148. C. 3√2

$frac{6 sqrt{10} }{2 sqrt{5} } \ = frac{6 sqrt{10} }{2 sqrt{5} } times frac{2 sqrt{5} }{2 sqrt{5} } \ = frac{12 sqrt{50} }{4 sqrt{25} } \ = frac{12 sqrt{50} }{4 times 5} \ = frac{3 sqrt{50} }{5} \ = frac{3 times sqrt{25} times sqrt{2} }{5} \ = frac{3 times 5 sqrt{2} }{5} \ = frac{15 sqrt{2} }{5} \ = 3 sqrt{2}$

149. D. 2√5

$frac{ sqrt{1000} }{5 sqrt{2} } times frac{5 sqrt{2} }{5 sqrt{2} } \ = frac{5 sqrt{2000} }{25 times sqrt{4} } \ = frac{5 sqrt{2000} }{50} \ = frac{5 times 20 sqrt{5} }{50} \ = frac{20 sqrt{5} }{10} \ = 2 sqrt{5}$