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

Toán Lớp 9: B) √5+√(√5-3)^2 C) 3/√7-√3 – 3/√7+√3

Home/ Toán Lớp 9: B) √5+√(√5-3)^2 C) 3/√7-√3 – 3/√7+√3

Toán Lớp 9: B) √5+√(√5-3)^2 C) 3/√7-√3 – 3/√7+√3

Tháng Tám 23, 2022 Toán học 2 Comments 0 views

Toán Lớp 9: B) √5+√(√5-3)^2
C) 3/√7-√3 – 3/√7+√3

Comments ( 2 )

  1. tuyetnhungthu
    tuyetnhungthu
    23 Tháng Tám, 2022 at 7:56 sáng
    Reply
    $\sqrt[]{5}+\sqrt[]{(\sqrt[]{5}-3)^2}$  
    $=\sqrt[]{5}+|\sqrt[]{5}-3|$
    $=\sqrt[]{5}+3-\sqrt[]{5}$
    $=3$
    $\dfrac{3}{\sqrt[]{7}}-\sqrt[]{3}-\dfrac{3}{\sqrt[]{7}}+\sqrt[]{3}$ 
    $=(\dfrac{3}{\sqrt[]{7}}-\dfrac{3}{\sqrt[]{7}})-(\sqrt[]{3}-\sqrt[]{3})$ 
    $=0-0$
    $=0$

  2. hoaiphuong85
    hoaiphuong85
    23 Tháng Tám, 2022 at 7:55 sáng
    Reply
    B) √5+√(√5-3)²
    =√5+5-6√5+9
    =14-5√5
    C, $\frac{3}{√7}$ -√3 – $\frac{3}{√7}$ +√3
    = $\frac{3}{√7}$ – $\frac{3}{√7}$ +√3-√3
    =0

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

Thúy Mai

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