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(1+r5-r3)(1-r5-r3)+(1-r7+r3)(1+r7+r3)=
r=radical
Va rog repede!!
Dau 20 de puncte!!


Răspuns :

(1+√5-√3)(1-√5-√3) + (1-√7+√3)(1+√7+√3) =
(1-√3+√5)(1-√3-√5)+(1+√3-√7)(1+√3+√7) =
(1-√3)² - 5 + (1+√3)² - 7 =
1 - 2√3 + 3 - 5 + 1 + 2√3 + 3 - 7 = -4