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2-√2 2-√2 (2+√2) 4-2 2
d. √3 - 2√7 =√3 - 2√7 (√3- 2√7) = 3+4.7 =3+28 = 31/-25
√3 + 2√7 √3 + 2√7 (√3 - 2√7) 3-4.7 3- 28