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

Toán Lớp 7: 7/8:(2/9-1/18) + 7/8:(1/36-5/12)

Toán Lớp 7: 7/8:(2/9-1/18) + 7/8:(1/36-5/12)

Comments ( 2 )

  1. Answer
    7/8 : (2/9 – 1/18) + 7/8 : (1/36 – 5/12)
    = 7/8 : (4/18 – 1/18) + 7/8 : (1/36 – 15/36)
    = 7/8 : 1/6 + 7/8 : {-7}/18
    = 7/8 . 6 + 7/8 . {-18}/7
    = 7/8 . (6 – 18/7)
    = 7/8 . 24/7
    = 24/8
    = 3

  2. 7/8:(2/9-1/18)+7/8:(1/36-5/12)
    =7/8:(4/18-1/18)+7/8:(1/36-15/36)
    =7/8 : 1/6+7/8:(-14/36)
    =7/8.(6-14/36)
    =7/8.(6-14/36)
    =7/8 . 24/7
    =3

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

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