Ответ:
3sqrt(20) + sqrt(28) + sqrt(45) - sqrt(63) =3 sqrt 4*5 + sqrt(4 * 7) + sqrt(9 * 5) - sqrt(9 * 7) =
= 3 * 2sqrt(5) + 2sqrt(7) + 3sqrt(5) - 3sqrt(7) = 6sqrt(5) - sqrt(7) + 3sqrt(5) = 9sqrt(5) - sqrt(7)
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Ответ:
3sqrt(20) + sqrt(28) + sqrt(45) - sqrt(63) =3 sqrt 4*5 + sqrt(4 * 7) + sqrt(9 * 5) - sqrt(9 * 7) =
= 3 * 2sqrt(5) + 2sqrt(7) + 3sqrt(5) - 3sqrt(7) = 6sqrt(5) - sqrt(7) + 3sqrt(5) = 9sqrt(5) - sqrt(7)