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

Toán Lớp 6: a;x+8=-17:b;35-x=37:c;-19-x=-20

Toán Lớp 6: a;x+8=-17:b;35-x=37:c;-19-x=-20

Comments ( 2 )

  1. a, x+8=-17
    x=-17-8
    x=-25
    Vậy x = -25
    b, 35-x=37
    x=35-37
    x=-2
    Vậy x = -2
    c, -19 – x=-20
    x=-19-(-20)
    x=-19+20
    x=1
    Vậy x = 1

  2. Đề bài :
    ⇒a, x + 8 = -17
    b, 35 – x = 37 
    c, -19 – x = -20
     Làm:
    ⇒ 
    a, x + 8 = -17
    ⇔ x = -17 – 8
    ⇔ x = -25
    ↓↓
    b, 35 – x = 37 
    ⇔ -x = 37 – 35
    ⇔ -x = 2
    ⇔ x = -2
    ↓↓
    c, -19 – x = -20
    ⇔ -x = -20 + 19
    ⇔ -x = -1
    ⇔ x = 1
     

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

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