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

Toán Lớp 5: 0,125:1/8+1/4:0,25-1/10:0,1 tính nhanh

Toán Lớp 5: 0,125:1/8+1/4:0,25-1/10:0,1
tính nhanh

Comments ( 2 )

  1. $\text{0,125 : }$ 1/8 + 1/4 $\text{: 0,25 -}$ 1/10 $\text{: 0,1}$
    $\text{= }$ 1/8 : 1/8 + 1/4 : 1/4 – 1/10 : 1/10
    $\text{= 1 + 1 – 1}$ 
    $\text{= 2 – 1}$
    = 1

  2. 0,125 : 1/8 + 1/4 : 0,25 – 1/10 : 0,1
    = 0,125 × 8 + 4 × 0,25 – 10 × 0,1
    = 0,1 × 1,25 × 8 + 0,1 × 2,5 × 4 – 0,1 × 10
    = 0,1 × ( 1,25 × 8 + 2,5 × 4 – 10 )
    = 0,1 × 10
    = 1

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

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