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=3√4.2 - √2 - 5√2
=3.2√2 - √2 - 5√2
=6√2 - √2 - 5√2
=√2
2). √7 + 3√7 - 4√7 + √49
= √7 + 3 √7 - 4√7 + 7
=7+√7
maaf kalau salah, semoga bermanfaat:)