1. 31√28 - 2√48 + √162 - 3√192
= 31√4 × 7 - 2√16 × 3 + 3√81 × 2 - 3√64 × 3
= 31.2√7 - 2.4√3 + 3.9√2 - 3.8√3
= 62√7 - 8√3 + 27√2 - 24√3
= 62√7 - 32√3 + 27√2
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1. 31√28 - 2√48 + √162 - 3√192
= 31√4 × 7 - 2√16 × 3 + 3√81 × 2 - 3√64 × 3
= 31.2√7 - 2.4√3 + 3.9√2 - 3.8√3
= 62√7 - 8√3 + 27√2 - 24√3
= 62√7 - 32√3 + 27√2