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13 +2√-1 -√25√-1 como √-1 = i remplazo
13 +2i -5i
12 -3i
2)19 - √-49 -(8 +√-81)
19 - √49√-1 - 8 -√81√-1
11 -7i -9i
11-16i
3 -5√-50 - (7 -2√-18)
3 -5√25√2√-1 -7 +2√9√2√-1
3- 5 *5√2i -7 +2*3√2i
-4 -25√2i +6√2i
-4 - 19√2i