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Four fives do not equal 18 - they equal 20.
They are worth 8.
(.5x5)x5+.5=13
55 + 5/5 = 56
Examples of sums using four fives to get 80:55+5×55!!×5+√(5×5)(55-5!!)/.5(5×5-5!!)/.55!-5×5-5!!((5!!/5)!)!/5×.(5)