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Answers
2√48 -3√27 -4√72 +3√128
=2√4×4×3 -3√3×3×3 -4√6×6×2+3√8×8×2
=2×4√3 -3×3√3 -4×6√2 +3×8√2
=8√3 -9√3 -24√2 +24√2
=-√3
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