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a^3+b^3=(a+b)(a^2-ab+b^2)
__1____ ____ (³√3)²-³√3 +1____________=
³√3 + 1 * (³√3)²-³√3 +1
=(³√3)²-³√3 +1/3+1=³√9-³√3 +1/4
2. ³√5/³√5-1=³√5(³√5+1)/(³√5-1)(³√5+1)=5+³√5/5-1=5+³√5/4