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(√2 - 3/5√3)²= (√2 - 3/5√3) (√2 - 3/5√3)
multiplicando
√2 - 3/5√3 x
√2 - 3/5√3
------------------------------
-3/5√3√2 +(-3/5√3)²+
√2²- 3/5√3√2
-----------------------------------
2-6/5√3√2+(9/25)3
resolviendo:
2-6/5√3√2+27/25
(2x25+27)/25-6/5√3√2
(50+27)/25-6/5√3√2
(77)/25-6/5√3√2
respuesta:
77/25-6/5√3√2