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

Toán Lớp 6: Đề bài tìm x (X-15)+15=100 D) 15.3-x=20

Toán Lớp 6: Đề bài tìm x
(X-15)+15=100
D)
15.3-x=20

Comments ( 2 )

  1. a) Cách 1: (x-15)+15=100
    => x-15 +15=100
    => x +(-15 +15) = 100
    => x + 0 = 100
    => x = 100
    Cách 2: (x-15)+15=100
    => x – 15 = 85
    => x = 100
    b) 15.3-x=20
    => 45 – x = 20
    => x = 25
    (Chúc bạn học tốt)
     

  2. 1) (x-15)+15=100
    x-15=100-15
    x-15=85
    x=85+15
    x=100
    Vậy x = 100
    2) 15.3-x=20
    45-x=20
    x=45-20
    x=25
    Vậy x = 25
     

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

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