hasil dari [tex]3 \sqrt{7} \times 2 \sqrt{21} - \sqrt{27} = ... \\ [/tex] jawab ya kakak

[tex]3 \sqrt{7} \times 2 \sqrt{21} - \sqrt{27} \\ = 6 \sqrt{147} - \sqrt{27} \\ = 6 \sqrt{49 \times 3} - \sqrt{9 \times 3} \\ = 6 \times 7 \sqrt{3} - 3 \sqrt{3} \\ = 42 \sqrt{3} - 3 \sqrt{3} \\ = 39 \sqrt{3} [/tex]