Respostas

2014-06-03T13:16:56-03:00
√18 = √2.9 = 3√2
√84 = √2².21 = 2√21
√4 = 2
√25 = 5
...............
√18-√84-√4+√25 = 3√2-2√21-2+5 = 3+3√2-2√21