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given --- 12√18 + 6√20 - 6√147 + 3√50 + 8√45
= 12√9×2 + 6√4×5 - 6√49×3 + 3√25×2 + 8√9×5
= 12×3√2 + 6×2√5 - 6×7√3 + 3×5√2 + 8×3√5
= 36√2 + 12√5 - 42√3 + 15√2 + 24√5
= 51√2 + 36√5 - 42√3
= 12√9×2 + 6√4×5 - 6√49×3 + 3√25×2 + 8√9×5
= 12×3√2 + 6×2√5 - 6×7√3 + 3×5√2 + 8×3√5
= 36√2 + 12√5 - 42√3 + 15√2 + 24√5
= 51√2 + 36√5 - 42√3
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