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87 / 7-2√5=?
=87 ×(7+2√5) / (7-2√5)×(7+2√5)
=609+174√5 / 7²-(2√5)²
=609+174√5 / 49-20
=609+174√5 / 29
=609+174×2.236068 / 29
=609+389.075832/29
=998.075832 / 29
=34.416408
=87 ×(7+2√5) / (7-2√5)×(7+2√5)
=609+174√5 / 7²-(2√5)²
=609+174√5 / 49-20
=609+174√5 / 29
=609+174×2.236068 / 29
=609+389.075832/29
=998.075832 / 29
=34.416408
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