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(√12-√6)(3√3+√6)
= (√4×3 - √6) (3√3 + √6)
=(2√3 - √6) (3√3 + √6)
= 6√9 + 2√18 - 3√18 - √36
= 6√9 - √18 - 6
= 6×3 - 3√2 - 6
= 12 - 3√2
rasional kan bentuk √7/√12-√5=