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

Toán Lớp 9: √3-2√2 + 3√2 – 2√8 + 2√2 giải giúp mình ạ

Toán Lớp 9: √3-2√2 + 3√2 – 2√8 + 2√2
giải giúp mình ạ

Comments ( 2 )

  1. √3-2√2+3√2-2√8+2√2
    =√3-2√2+3√2-4√2+2√2
    =√3-√2

  2. $\sqrt{3 – 2\sqrt{2}}$ + 3$\sqrt{2}$ – 2$\sqrt{8}$ + 2$\sqrt{2}$ 
    = $\sqrt{2 – 2\sqrt{2} + 1}$ – 2$\sqrt{4.2}$ + (3$\sqrt{2}$ + 2$\sqrt{2}$)
    = $\sqrt{(\sqrt{2} – 1)²}$ – 2.2$\sqrt{2}$ + 5$\sqrt{2}$
    = |$\sqrt{2}$ – 1| – 4$\sqrt{2}$ + 5$\sqrt{2}$
    = $\sqrt{2}$ – 1 – 4$\sqrt{2}$ + 5$\sqrt{2}$
    = 2$\sqrt{2}$ – 1
    Chúc bạn học tốt 
     

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

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