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

Toán Lớp 7: (2/3)mũ 3 : (2/3)mũ 2 +(-1 1/2):1,5

Toán Lớp 7: (2/3)mũ 3 : (2/3)mũ 2 +(-1 1/2):1,5

Comments ( 2 )

  1. (2/3)^3 : (2/3)^2 + (-1 1/2) : 1,5
    = 2/3 + -3/2 : 3/2
    = 2/3 + -3/2 . 2/3
    = 2/3 . (1 + -3/2)
    = 2/3 . -1/2
    = -1/3

  2. đề chữ hơi xấu do vội…

    toan-lop-7-2-3-mu-3-2-3-mu-2-1-1-2-1-5

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

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