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

Toán Lớp 4: Tính bằng cách thuận tiện nhất. a.2x53x5 b 25x9x4x100

Toán Lớp 4: Tính bằng cách thuận tiện nhất. a.2x53x5 b 25x9x4x100

Comments ( 2 )

  1. a) 2×53×5
    = (2×5)×53
    = 10×53
    = 530
    b) 25×9×4×100
    = (25×4)×(9×100)
    = 100×900
    = 90000
    @Sú

  2. $\text{ a, 2 × 53 × 5 }$
    $\text{ = ( 2 × 5 ) × 53 }$
    $\text{ = 10 × 53 }$
    $\text{ = 530 }$
    $\text{ b, 25 × 9 × 4 × 100 }$
    $\text{ = ( 25 × 4 ) × 9 × 100 }$
    $\text{ = 100 × 9 × 100 }$
    $\text{ = ( 100 × 100 ) × 9 }$
    $\text{ = 10 000 × 9 }$
    $\text{ = 90 000 }$
     

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

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