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

Toán Lớp 7: ( -2 ) × – 38/ 21 × -7 /4 × ( -3/8 )

Toán Lớp 7: ( -2 ) × – 38/ 21 × -7 /4 × ( -3/8 )

Comments ( 2 )

  1. (-2). -38/21 . -7/4 . (-3/8)
    = 76/21 . -7/4 . (-3/8)
    = -19/3 . (-3/8)
    = 19/8
     

  2. ~ Bạn tham khảo ~
    (-2) xx [-38]/21 xx [-7]/4 xx (-3)/8
    = [-2xx(-38)xx(-7)xx(-3)]/[1xx21xx4xx8]
    = [-1xx(-38)xx(-1)xx(-3)]/[1xx3xx4xx4]
    = 114/48
    = 19/8

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