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

Toán Lớp 6: Tinh hợp lí: a. 25 x 7 x 10 x 4 b.8 x 12 x 125 x 2 c.25 x 50 x 4 x 36

Toán Lớp 6: Tinh hợp lí:
a. 25 x 7 x 10 x 4
b.8 x 12 x 125 x 2
c.25 x 50 x 4 x 36

Comments ( 2 )

  1. a. 25 × 7 × 10 × 4
    = (25×4)×(7×10)
    = 100×70
    = 7000
    b.8 × 12 × 125 × 2
    = (8×125)×(12×2)
    = 1000×24
    = 24000
    c.25 × 50 × 4 × 36
    = (25×4) × (50×36)
    = 100×1800
    = 180000

  2. a,
    25 × 7 × 10 × 4
    = (25 × 4) × (7 × 10)
    = 100 × 70
    = 7000
    b,
    8 × 12 × 125 ×2
    = (8 × 125) × (12 × 2)
    = 1000 × 24
    = 24000
    c,
    25 × 50 × 4 × 36
    = (25 × 4) × 10 × 5 × 36
    = 100 × 10 × 180
    = 1000 × 180
    = 180000
     

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

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