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

Toán Lớp 7: (-2,5).8,6.(-4).0,48+8,6.(-3,8)

Toán Lớp 7: (-2,5).8,6.(-4).0,48+8,6.(-3,8)

Comments ( 2 )

  1. (-2,5) . 8,6 . (-4) . 0,48 + 8,6 . (-3,8)
    = 8,6. [(-2,5) . (-4) . 0,48] + 8,6 . (-3,8)
    = 8,6 . 4,8 + 8,6 . (-3,8)
    = 41,28 + (-32,68)
    = 8,6
     

  2. (-2,5).8,6.(-4).0,48+8,6.(-3,8)
    =8,6.[(-2,5).(-4).0,48]+8,6.(-3,8)
    =8,6.4,8+8,6.(-3,8)
    =8,6.[4,8+(-3,8)]
    =8,6.1
    =8,6
     

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