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

Toán Lớp 7: a) -x+1/2=6 b) |x-1/2|=0 c) |4-1/2|=3/4

Tháng Mười 11, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a) -x+1/2=6
b) |x-1/2|=0
c) |4-1/2|=3/4

Comments ( 2 )

  1. kimnguenoanh
    kimnguenoanh
    11 Tháng Mười, 2022 at 9:03 chiều
    Reply
    ~ Bạn tham khảo ~
    a) -x + 1/2 = 6
    -x = 6 – 1/2
    -x = 12/2 – 1/2
    -x = 11/2
    x = -11/2
    Vậy x = 11/2
    b) |x-1/2|=0
    => x – 1/2 = 0
    x = 0 – 1/2
    x = -1/2
    Vậy x = -1/2
    c)|4x-1/2|=3/4
    TH 1 : 4x – 1/2 = 3/4
    4x = 3/4 + 1/2
    4x = 3/4 + 2/4
    4x = 5/4
    x = 5/4 : 4
    x = 5/4 . 1/4
    x = 5/16
    TH 2 : 4x – 1/2 = -3/4
    4x = -3/4 + 1/2
    4x = -3/4 + 2/4
    4x = -1/4
    x = -1/4 : 4
    x = -1/4 . 1/4
    x = -1/16
    Đề bài 2 : | 4 -1/2x| = 3/4
    TH 1 : 4 – 1/2x = 3/4
    1/2x = 4-3/4
    1/2x = 13/4
    x = 13/4 : 1/2
    x = 13/4 . 2
    x = 26/4
    TH 2 : 4 – 1/2x = -3/4
    1/2x = 4-(-3)/4
    1/2x = 19/4
    x = 19/4 : 1/2
    x = 19/4 . 2
    x= 19/2
    $#Vịt vàng$
     

  2. cattien
    cattien
    11 Tháng Mười, 2022 at 9:03 chiều
    Reply
    $\\$
    a,
    -x+1/2=6
    ->-x=6-1/2
    ->-x=12/2 – 1/2
    ->-x=11/2
    ->x=(-11)/2
    Vậy x=(-11)/2
    $\\$
    b,
    |x-1/2|=0
    ->x-1/2=0
    ->x=0+1/2
    ->x=1/2
    Vậy x=1/2
    $\\$
    c,
    Đề là : |4x-1/2|=3/4
    TH1 :
    ->4x-1/2=3/4
    ->4x=3/4 + 1/2
    ->4x=3/4 + 2/4
    ->4x=5/4
    ->x=5/4 : 4
    ->x=5/16
    TH2 :
    ->4x-1/2=(-3)/4
    ->4x=(-3)/4 + 1/2
    ->4x=(-3)/4 + 2/4
    ->4x=(-1)/4
    ->x=(-1)/4 :4
    ->x=(-1)/16
    Vậy x=5/16 hoặc x=(-1)/16
    Đề là : |4-1/2x|=3/4
    TH1 :
    -> 4-1/2x=3/4
    ->1/2x=4-3/4
    ->1/2x=16/4-3/4
    ->1/2 x=13/4
    -> x=13/4 : 1/2
    ->x=13/2
    TH2 :
    ->4-1/2x=(-3)/4
    ->1/2x=4+3/4
    ->1/2x=16/4+3/4
    ->1/2x=19/4
    ->x=19/4 : 1/2
    ->x=19/2
    Vậy x=13/2 hoặc x=19/2

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