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

Toán Lớp 4: tính bằng cách thuận tiện: 4 x 124 x 125 + 4x 175 x 25 + 4 x 25

Toán Lớp 4: tính bằng cách thuận tiện:
4 x 124 x 125 + 4x 175 x 25 + 4 x 25

Comments ( 2 )

  1.                                             Bài làm
    4 x 124 x 125 + 4 x 175 x 25 + 4 x 25
    = 125 x ( 4 x 25 + 175 x 4 )
    = 125 x ( 100 + 700 )
    = 125 x 800
    =  100000.
     

  2. $\text{4 × 124 × 125 + 4 × 175 × 25 + 4 × 25}$
    $\text{= 4 × 25 × 5 × 124 + 4 × 175 × 25 + 4 × 25}$
    $\text{= 100 × 5 × 124 + 100 × 175 + 100}$
    $\text{= 100 × 620 + 100 × 175 + 100}$
    $\text{= 100 × ( 620 + 175 + 1 )}$
    $\text{= 100 × 796}$
    $\text{= 79 600}$

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

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