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

Toán Lớp 4: Câu 4: Tính nhanh: 12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24

Toán Lớp 4: Câu 4: Tính nhanh:
12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24

Comments ( 2 )

  1. 12345 × 17 + 23 × 12345 + 12345 + 12345 × 35 + 12345 × 24
    $\\$
    = 12345 × ( 17 + 23 + 1 + 35 + 24 )
    $\\$
    = 12345 × 100
    $\\$
    = 1234500
    $\\$
    Áp dụng công thức :
    $\\$
    a × ( b + c ) = a × b + a × c
     

  2. 12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24
    = 12345 x 17 + 23 x 12345 + 12345 x 1 + 12345 x 35 + 12345 x 24
    = (17 + 23 + 1 +35 +24 ) x 12345
    = 100 x 12345
    = 123450
     

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

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