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Bentuk sederhana dari 2 3 ​ + 5 ​ 21 ​ adalah ...

Bentuk sederhana dari adalah ...

  1. begin mathsize 14px style 6 square root of 3 minus 6 square root of 5 end style

  2. begin mathsize 14px style 6 square root of 3 minus 3 square root of 5 end style

  3. begin mathsize 14px style 6 square root of 3 minus square root of 5 end style

  4. begin mathsize 14px style 6 square root of 3 plus square root of 5 end style

  5. begin mathsize 14px style 6 square root of 3 plus 3 square root of 5 end style

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F. Kurnia

Master Teacher

Mahasiswa/Alumni Universitas Jember

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Pembahasan

begin mathsize 14px style fraction numerator 21 over denominator 2 square root of 3 plus square root of 5 end fraction equals fraction numerator 21 over denominator 2 square root of 3 plus square root of 5 end fraction cross times fraction numerator 2 square root of 3 minus square root of 5 over denominator 2 square root of 3 minus square root of 5 end fraction  equals fraction numerator 21 space open parentheses 2 square root of 3 minus square root of 5 close parentheses over denominator 12 minus 5 end fraction  equals 3 space open parentheses 2 square root of 3 minus square root of 5 close parentheses  equals 6 square root of 3 minus 3 square root of 5 end style

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