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

Toán Lớp 7: 3. a) x-5/6=4/5 b) √x-3=2 c) |x-3/4|-0,5=0 Mỗi bài 10đ nha mọi ngừiiiiiiiiiiiiiii

Home/ Toán Lớp 7: 3. a) x-5/6=4/5 b) √x-3=2 c) |x-3/4|-0,5=0 Mỗi bài 10đ nha mọi ngừiiiiiiiiiiiiiii

Toán Lớp 7: 3. a) x-5/6=4/5 b) √x-3=2 c) |x-3/4|-0,5=0 Mỗi bài 10đ nha mọi ngừiiiiiiiiiiiiiii

Tháng Bảy 31, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: 3.
a) x-5/6=4/5
b) √x-3=2
c) |x-3/4|-0,5=0
Mỗi bài 10đ nha mọi ngừiiiiiiiiiiiiiii

Comments ( 2 )

  1. tuanh
    tuanh
    31 Tháng Bảy, 2022 at 9:43 chiều
    Reply
    a, x – 5/6 = 4/5
    $\Rightarrow$ x = 4/5 + 5/6
    $\Rightarrow$ x = 49/30
    $\text{Vậy}$ x = 49/30
    _____________
    b, \sqrt{x – 3} = 2 (x \ge 3)
    $\Rightarrow$ x – 3 = 2^{2}
    $\Rightarrow$ x – 3 = 4
    $\Rightarrow$ x = 4 + 3
    $\Rightarrow$ x = 7
    $\text{Vậy}$ x = 7
    _______________
    c, |x – 3/4| – 0,5 = 0 
    $\Rightarrow$ |x – 3/4| = 0 + 0,5
    $\Rightarrow$ |x – 3/4| = 0,5
    $\Rightarrow$ |x – 3/4| = 1/2
    $\text{TH1:}$
    x – 3/4 = 1/2
    $\Rightarrow$ x = 1/2 + 3/4
    $\Rightarrow$ x = 5/4
    $\text{TH2:}$
    x – 3/4 = -1/2
    $\Rightarrow$ x = -1/2 + 3/4
    $\Rightarrow$ x = 1/4
    $\text{Vậy}$ x \in {5/4 ; 1/4}
     

  2. thuminhthong
    thuminhthong
    31 Tháng Bảy, 2022 at 9:43 chiều
    Reply
    Giải đáp:
     

    toan-lop-7-3-a-5-6-4-5-b-3-2-c-3-4-0-5-0-moi-bai-10d-nha-moi-nguiiiiiiiiiiiiiii

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

Thanh Hường

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