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

Toán Lớp 6: 1,Tính: a,1/2 – 1/2 . 4/5 + 4/5 . 5/6 2,tìm x: a,x- 1/2 = 0.75 b,5x +4/5=0.5 +25%

Toán Lớp 6: 1,Tính:
a,1/2 – 1/2 . 4/5 + 4/5 . 5/6
2,tìm x:
a,x- 1/2 = 0.75
b,5x +4/5=0.5 +25%

Comments ( 2 )

  1. Chúc bạn học tốt ????

    Xin ctlhn ạ
    toan-lop-6-1-tinh-a-1-2-1-2-4-5-4-5-5-6-2-tim-a-1-2-0-75-b-5-4-5-0-5-25

  2. 1,
    a, 1/2 – 1/2 . 4/5 + 4/5 . 5/6
    = 1/2 – 4/5 . ( 1/2 + 5/6 )
    = 1/2 – 4/5 . 4/3
    = 1/2 – 16/15
    = ( – 17 )/30
    2,
    a, x – 1/2 = 0,75
    ⇔ x – 1/2 = 3/4
    ⇔ x = 3/4 + 1/2
    ⇔ x = 5/4
    Vậy , x = 5/4 .
    b, 5x + 4/5 = 0,5 + 25%
    ⇔ 5x + 4/5 = 1/2 + 1/4
    ⇔ 5x + 4/5 = 3/4
    ⇔ 5x = 3/4 – 4/5
    ⇔ 5x = ( – 1 )/20
    ⇔ x = ( – 1 )/20 : 5
    ⇔ x = ( – 1 )/100
    Vậy , x = ( – 1 )/100 .

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

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