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yang kedua 5 +√3
4×(3+√7) / (3-√7)×(3+√7)=
12+4√7 / 9+3√7-3√7-7=
12+4√7 / 2= 6+2√7
2√5 / (√5-√3) =
2√5×(√5+√3) / (√5-√3)×(√5+√3)=
2×5+2√3 / 5+√15-√15-3=
10+2√3 / 2= 5+√3