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

Toán Lớp 5: 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x12 tính nhanh

Toán Lớp 5: 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x12 tính nhanh

Comments ( 2 )

  1. 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12
    ⇒ [ 3 × 8 ] × 25 + [ 4 × 6 ] × 37 + [ 2 × 12 ] × 38
    ⇒ 24 × 25 + 24 × 37 + 24 × 38
    ⇒ 24 × [ 25 + 37 + 38 ]
    ⇒ 24 × 100
    ⇒ 2400 
     

  2. 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12
    =  24 x 25 + 24 x 37 + 24 x 38
    = 24 x ( 25 + 37 + 38 )
    = 24 x     100
    = 2400

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