Penjelasan dengan langkah-langkah:
(a)
[tex] \sqrt{800} \\ \\ = \sqrt{400 \times 2} \\ \\ = 20 \sqrt{2} [/tex]
(b)
[tex]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} [/tex]
(c)
[tex]\sqrt{90} \div \sqrt{5} \times 3 \sqrt{2}[/tex]
[tex]= \sqrt{9 \times 2 \times 5} \div \sqrt{5} \times 3 \sqrt{2}[/tex]
[tex] = 3 \sqrt{2} \sqrt{5} \div \sqrt{5} \times 3 \sqrt{2}[/tex]
[tex] = 3 \sqrt{2} \times 3 \sqrt{2}[/tex]
[tex] = (3 \times 3) \sqrt{2 \times 2}[/tex]
[tex] = 9 \sqrt{4}[/tex]
[tex] = 9 \times 2[/tex]
[tex] = 18[/tex]
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