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

Toán Lớp 4: Tính bằng cách thuận tiện nhất 128 x 15 + 128 x 7 – 128 x 12

Toán Lớp 4: Tính bằng cách thuận tiện nhất
128 x 15 + 128 x 7 – 128 x 12

Comments ( 2 )

  1. 128 × 15 + 128 × 7 – 128 × 12
    = 128 × (15 + 7 – 12)
    = 128 × (22 – 12)
    = 128 × 10
    = 1280
     
     

  2. _____________________________________
    128 × 15 + 128 × 7 – 128 × 12
    = 128 × (15 + 7 – 12)
    = 128 × 10
    = 1280

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

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