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

Toán Lớp 5: a.7,5 x 5 + 7,5 x 3 + 15 b. 24 x 0,25 + 37 x 25% + 39 x 1/4

Toán Lớp 5: a.7,5 x 5 + 7,5 x 3 + 15
b. 24 x 0,25 + 37 x 25% + 39 x 1/4

Comments ( 2 )

  1. a) 7,5 × 5 + 7,5 × 3 + 15
    = 7,5 × (5 + 3) + 15
    = 7,5 × 8 + 15
    = 60  + 15
    = 75
    b) 24 × 0,25 + 37 × 25% + 39 × 1/4
    = 24 × 0,25 + 37 × 0,25 + 39 × 0,25
    = 0,25 × (24 + 37 + 39)
    = 0,25 × 100
    = 25

  2. a) 7,5 x 5 + 7,5 x 3 + 15
    = 7,5 x 5 + 7,5 x 3 + 7,5 x 2
    = 7,5 x (5 + 3 + 2)
    = 7,5 x 10
    = 75
    b) 24 x 0,25 + 37 x 25 % + 39 x $\frac{1}{4}$ 
    = 24 x 0,25 + 37 x 0,25 + 39 x 0,25
    = (24 + 37 + 39) x 0,25
    = 100                  x 0,25
    =            25
    Chúc bn hok tốt !
    # Moon
    # HONKAI IMPACT
     

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

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