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+0 +1 +1 +2 +3 +5 +8 +13 +21
+1 +0 +1 +1 +2 +3 +5 +8
* -1 +1 +0 +1 +1 +2 +3
(*Sumamos intercalademente. Ej: -1 + 1 = 0; +1 +0 = +1 ; +1 +1 = +2; finalmente: +1 + 2 = +3).
Rpta: 55.
Espero haberte ayudado...