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

Toán Lớp 7: P = 1/2 – 1/2 ( x : 1/6 – 1/4 ) – 2 |3x – 2 |

Toán Lớp 7: P = 1/2 – 1/2 ( x : 1/6 – 1/4 ) – 2 |3x – 2 |

Comments ( 2 )

  1. P=1/2-1/2(x:1/6-1/4)-2|3x-2|
    P=1/2-1/2(6x-1/4)-2|3x-2|
    P=1/2-3x+1/8-2|3x-2|
    P=5/8-3x-2|3x-2|  
    TH1: 3x-2≥0
    P viết lại ta được:
    P=5/8-3x-2(3x-2)
    P=5/8-3x-6x+4
    P=-9x+(37)/(8)
    TH2: 3x-2<0
    P viết lại ta được:
    P=5/8-3x-2(-3x+2)
    P=5/8-3x+6x-4
    P=3x-(27)/(8)

  2. P=1/2 – 1/2 (x : 1/6 – 1/4) – 2 |3x – 2|
    =1/2 – 1/2 (6x – 1/4) – 2 |3x-2|
    =1/2 – 3x + 1/8 – 2 |3x-2|
    =5/8 – 3x -2 |3x-2|
    TH1:3x-2 ≥ 0
    =>P=5/8 – 3x -2 (3x-2)
    =5/8 – 3x – 6x + 4
    =37/8 – 9x
    TH2: 3x-2<0
    =>P=5/8 – 3x -2 (2x-3)
    =5/8 – 3x – 4+ 6x
    =3x – 27/8

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