Bantuin kk): besok di kumpul );

Bantuin kk): besok di kumpul );

Penjelasan dengan langkah-langkah:

(a)

$sqrt{800} \ \ = sqrt{400 times 2} \ \ = 20 sqrt{2}$

(b)

$5 sqrt{32} + 3 sqrt{50} - sqrt{72} \ \ = 5 sqrt{16 times 2} + 3 sqrt{25 times 2} - sqrt{36 times 2} \ \ = (5 times 4) sqrt{2} + (3 times 5) sqrt{2} - 6 sqrt{2} \ \ = 20 sqrt{2} + 15 sqrt{2} - 6 sqrt{2} \ \ = (20 + 15 - 6) sqrt{2} \ \ = 29 sqrt{2}$

(c)

$sqrt{90} div sqrt{5} times 3 sqrt{2}$

$= sqrt{9 times 2 times 5} div sqrt{5} times 3 sqrt{2}$

$= 3 sqrt{2} sqrt{5} div sqrt{5} times 3 sqrt{2}$

$= 3 sqrt{2} times 3 sqrt{2}$

$= (3 times 3) sqrt{2 times 2}$

$= 9 sqrt{4}$

$= 9 times 2$

$= 18$