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

Toán Lớp 5: TÍNH NHANH 1/2 + 0.5 x 40 + 50/100 x 20 + 50 % x 39

Toán Lớp 5: TÍNH NHANH
1/2 + 0.5 x 40 + 50/100 x 20 + 50 % x 39

Comments ( 2 )

  1. 1/2 + 0,5 × 40 + 50/100 × 20 + 50% × 39
    = 0,5 + 0,5 × 40 + 0,5 × 20 + 0,5 × 39
    = 0,5 × ( 1 + 40 + 20 + 39 )
    = 0,5 × 100
    = 50
     

  2. 1/2 + 0,5 \times 40 + 50/100 \times 20 + 50% \times 39
    = 1/2 + 1/2 \times 40 + 1/2 \times 20 + 1/2 \times 39
    = 1/2 \times ( 1 + 40 + 20 + 39)
    = 1/2 \times 100
    = 50
     

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