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

Toán Lớp 3: Tính nhanh: 54×275+825×15+275

Toán Lớp 3: Tính nhanh:
54×275+825×15+275

Comments ( 2 )

  1. 54 × 275 + 825 × 15 + 275
    = 275 × ( 54 + 1 ) + 825 × 15
    = 275 × 55 + 12375
    = 15125 + 12375
    = 27500

  2. $Cách $ $1$ :
    $\text{ 54 × 275 + 825 × 15 + 275 }$
    $\text{ = 275 × ( 54 + 1 ) + 825 × 15 }$
    $\text{ = 275 × 55 + 55 × 15 × 15 }$
    $\text{ = 275 × 55 + 55 × 225 }$
    $\text{ = 55 × ( 275 + 225 ) }$
    $\text{ = 55 × 500 }$
    $\text{ = 27 500 }$
    $Cách$ $2$ : 
    $\text{ 54 × 275 + 825 × 15 + 275 }$
    $\text{ = 275 × 54 + 275 × 3 × 15 + 275}$
    $\text{ = 275 × 54 + 275 × 45 + 275 }$
    $\text{ = 275 × ( 54 + 45 + 1) }$
    $\text{ = 275 × 100 }$
    $\text{ = 27 500 }$

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

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