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(a+b)(a-b)=a^2 - b^2
entonces
b).. (√3+5).(√3-5)
......(√3)^2 - 5^2 = 3-25= -22
en la a) es distributiva
a).. (3+√5).(5-√3)
..... 3(5)-3√3+√5(5)-(√5)(√3)
..... 15-3√3+5√5-√15