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

Toán Lớp 7: 1/3-1/3(x+2)=x-2 helpppppppppppppppppppppp Me ĐANG CẦN GẤP

Toán Lớp 7: 1/3-1/3(x+2)=x-2
helpppppppppppppppppppppp Me
ĐANG CẦN GẤP

Comments ( 2 )

  1. Giải đáp:
    x=5/4
    Lời giải và giải thích chi tiết:
    1/3 – 1/3 (x+2)=x-2
    ⇔ 1/3 – 1/3x – 2/3 = x-2
    ⇔ -1/3x + (1/3-2/3)=x-2
    ⇔ -1/3x-1/3=x-2
    ⇔ -1/3x-x=1/3-2
    ⇔(-1/3-1)x=-5/3
    ⇔ (-4)/3x=(-5)/3
    ⇔x=(-5)/3÷(-4)/3
    ⇔x=5/4
    Vậy x=5/4
     

  2. 1/3-1/3(x+2)=x-2
    \to 1/3-1/3x-2/3=x-2
    \to -1/3-1/3x=x-2
    \to -1/3x-x=-2+1/3
    \to -4/3x=-5/3
    \to x=-5/3:(-4/3)
    \to x=5/4
    Vậy x=5/4
     

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

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