Question

Решите 1.4.8 1.4.9 1.4.10

Answer 1

$1.4.8) frac{78}{?}$
$1.4.8) frac{78}{(2 sqrt{3}) {}^{2} } = frac{78}{4 times 3} = frac{78}{12} = frac{26}{4} = frac{13}{2} = 6 frac{1}{2} \ 1.4.9)2 sqrt{19} times 2 sqrt{3} times sqrt{57} \ 4 sqrt{19 times 3 times 57} = 4 sqrt{3249} = 4 times 57 = 228 \ 1.4.10)3 sqrt{23} times 2 sqrt{3} times sqrt{69} \ 3 times 2 sqrt{23 times 3 times 69} = 6 sqrt{4761} = 6 times 69 = 414$