4√20-√180+3√12+2√108=?
\/20 = \/(4x5) = 2\/5
\/180 = \/2x90 = \/4x45 = 2\/45 = 2\/9x5 = 2x3\/5 = 6\/5
4.2\/5 + 6\/5 + 3\/12 + 2\/108 =
8\/5 + 6\/5 + 3\/4x3 + 2\/4x3x9 =
14\/5 + 3.2\/3 + 2.2.3\/3 =
14\/5 + 6\/3 +12\/3 =
14\/5 + 18\/3
