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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: ( √3+ √6) ( √2-1) Câu dễ cho các bạn nè!!

Toán Lớp 9: ( √3+ √6) ( √2-1)
Câu dễ cho các bạn nè!!

Comments ( 2 )

  1. $(\sqrt{3}+\sqrt{6})(\sqrt{2}-1)$
    $=(\sqrt{3}+\sqrt{3}.\sqrt{2})(\sqrt{2}-1)$
    $=\sqrt{3}.(\sqrt{2}+1).(\sqrt{2}-1)$
    $=\sqrt{3}.(\sqrt{2}^2-1^2)$
    $=\sqrt{3}.(2-1)$
    $=\sqrt{3}$

  2. Giải đáp:
    (\sqrt{3} + \sqrt{6})(\sqrt{2} -1)$\\$= \sqrt{6} + 2\sqrt{3} – \sqrt{3} – \sqrt{6}$\\$= (\sqrt{6} -\sqrt{6} )+(2\sqrt{3} – \sqrt{3})$\\$= \sqrt{3}

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222-9+11+12:2*14+14 = ? ( )