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

Toán Lớp 6: 75% – 1 và 1/2 +0,5 : 5/12 – (1/2) ²

Toán Lớp 6: 75% – 1 và 1/2 +0,5 : 5/12 – (1/2) ²

Comments ( 2 )

  1. 75% – 1 1/2 + 0,5 : 5/12 – (1/2)^2
    = 3/4 – 3/2 + 1/2 : 5/12 – 1/4
    = 3/4 – 6/4 + 6/5 – 1/4
    = (3/4 – 6/4 – 1/4) + 6/5
    = -1 + 6/5
    = (-5)/5 + 6/5
    = 1/5

  2. 75% – 1 1/2 +  0,5 : 5/12 – (1/2)^2
    = 3/4 – 3/2 + 0,5 . 12/5 – 1/4
    = 3/4 – 6/4 + 6/5 -1/4
    = (3/4 – 6/4 -1/4) + 6/5
    =  -1 +6/5
    = -5/5 +6/5
    = 1/5

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