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

Toán Lớp 6: 3.22 a, 32-34+36-38+40-42 b, 92-(55-8)+(-45)

Toán Lớp 6: 3.22
a, 32-34+36-38+40-42
b, 92-(55-8)+(-45)

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a)
    32 – 34 + 36 – 38 + 40 – 42
    = (32 – 34) + (36 – 38) + (40 – 42)
    = -2 + (-2) + (-2)
    = -6
    b)
    92 – (55 – 8) + (-45)
    = 92 – 55 + 8 – 45
    = 92 + 8 – 55 – 45
    = 100 – 100
    = 0

  2. Giải đáp:
    a, 32-34+36-38+40-42
    = (32 – 34) + (36 – 38) + (40 – 42)
    = – (34 – 32) – (38 – 36) – (42 – 40)
    = – 2 – 2 – 2
    = – (2 + 2 + 2)
    = – 6
    b, 92-(55-8)+(-45)
    = 92 – 55 + 8 – 45
    = (92 + 8) – (55 + 45)
    = 100 – 100 
    = 0
    __Chucbanhoctot:)
     
     

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