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

Toán Lớp 7: -1/2-2(-1/2)^2+1/5+1/5+25(-1/5)^2

Toán Lớp 7: -1/2-2(-1/2)^2+1/5+1/5+25(-1/5)^2

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    -1/2 – 2 . (-1/2)^2 + 1/5 + 1/5 + 25 . (-1/5)^2
    = -1/2 – 2 . 1/4 + 1/5 . 2 + 25 . 1/25
    = -1/2 – 1/2 + 2/5 + 1
    = -1 + 2/5 + 1
    = 2/5

  2. -1/2 – 2 ( -1/2)^2 + 1/5 + 1/5 + 25 . (-1/5)^2
    = -1/2 – 2 . 1/4 + (1/5 + 1/5) + 25 .  1/25
    = -1/2 – 1/2 +  2/5 + 1
    = -1 + 2/5 + 1
    = (-1 + 1) + 2/5
    = 0 + 2/5
    = 2/5

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

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