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

Toán Lớp 9: (1-$\frac{ √3-1}{2}$ ):( $\frac{√3-1}{2}$ +2)

Tháng Chín 12, 2022 Toán học 1 Comment 0 views

Toán Lớp 9: (1-$\frac{ √3-1}{2}$ ):( $\frac{√3-1}{2}$ +2)

Comments ( 1 )

  1. cobebongdem
    cobebongdem
    12 Tháng Chín, 2022 at 8:42 chiều
    Reply
    Giải đáp:
    (1-(\sqrt{3}-1)/2):((\sqrt{3}-1)/2+2)
    =((2-\sqrt{3}+1)/2):((sqrt{3}-1+4)/2)
    =(3-\sqrt{3})/2:(3+\sqrt{3})/2
    =[(3-\sqrt{3}).2]/[(3+\sqrt{3}).2]
    =(3-\sqrt{3})/(3+\sqrt{3})
    =[(3-\sqrt{3})(3-\sqrt{3})]/[(3-\sqrt{3})(3+\sqrt{3})]
    =(3-\sqrt{3})^2/(9-3)
    =(9-2.3\sqrt{3}+3)/6
    =(12-6\sqrt{3})/6
    =2-\sqrt{3}

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

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