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

Toán Lớp 4: 25 * 20 *125 * 8 – 8 * 20 * 5 * 125 tính nhanh

Toán Lớp 4: 25 * 20 *125 * 8 – 8 * 20 * 5 * 125
tính nhanh

Comments ( 2 )

  1. 25 × 20 × 125 × 8 – 8 × 20 × 5 × 125
    = ( 25 × 20 ) × ( 125 × 8 ) – ( 8 × 125 ) × ( 20 × 5 )
    = 500 × 1000 – 1000 × 100
    = 500 000 – 100 000
    = 400 000
    @Rin

  2. 25 × 20 × 125 × 8 – 8 × 20 × 5 × 125
    = 20 × 125 × 8 × ( 25 – 5 )
    = 20 × 125 × 8 × 20
    = ( 20 × 20 ) × ( 125 × 8 ) 
    = 400 × 1000
    = 400 000

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

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