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

Toán Lớp 6: `2,` Tìm `x:` a, `x-3/25=1/20` b, `3.x+1/2=-4/5` c, `2/9-(x-1/3)=1/6` d, `(2x-1/3).(x+5/16)=0`

Tháng Hai 3, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: 2, Tìm x:
a, x-3/25=1/20
b, 3.x+1/2=-4/5
c, 2/9-(x-1/3)=1/6
d, (2x-1/3).(x+5/16)=0

Comments ( 2 )

  1. tuenhioanh
    tuenhioanh
    3 Tháng Hai, 2023 at 12:20 sáng
    Reply
    2, a) x – 3/25 =1/20
    x= 1/20+3/25
    x= 0,05+0,12
    x= 0,17
    Vậy x=0,17
    b) 2 * x + 1/2 = -4/5
    2 * x = -4/5 – 1/2
    2 * x = -13/10
    x = -13/10 * 1 /2
    x = -13/20
    Vậy x = -13/20
    c) 2/9 – ( x – 1/3) = 1/6
    x – 1/3 = 2/9 -1/6
    x – 1/3 = 1/18
    x = 1/18 + 1/3
    x = 7/18
    Vậy x = 7/18
    d) ( 2x – 1/3) * ( x + 5/16) = 0
    TH1: 2x – 1/3 = 0
    2x = 0 + 1/3 = 1/3
    x = 1/3 * 1/2
    x = 1/6
    TH2: x + 5/16 =0
    x = 0 – 5/16
    x = -5/16
    Vậy x = 1/6 hoặc x= -5/16

  2. huyenmi76
    huyenmi76
    3 Tháng Hai, 2023 at 12:19 sáng
    Reply
    \text{a)}
    x -3/25 =1/20
    -> x = 1/20 +3/25
    -> x = 17/100
    Vậy x= 17/100
    $\\$
    \text{b)}
    3x +1/2 = -4/5
    -> 3x = -4/5 -1/2
    -> 3x = -13/10
    -> x = -13/30
    Vậy x  = -13/30
    $\\$
    \text{c)}
    2/9 – (x-1/3) =1/6
    -> x – 1/3 = 2/9 -1/6
    -> x – 1/3 = 1/18
    -> x = 1/18 +1/3
    -> x =  7/18
    Vậy x = 7/18
    $\\$
    \text{d)}
    (2x-1/3)(x+5/16) =0
    -> 2x – 1/3 =0 hoặc x+5/16 =0
    Xét 2x – 1/3 = 0
    -> 2x = 1/3
    -> x = 1/6
    Xét x+5/16 = 0
    -> x = -5/16
    Vậy x \in {1/6 ; -5/16}

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

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