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

Toán Lớp 4: Tính nhanh: 4/7×17/18×7/4×18/7

Toán Lớp 4: Tính nhanh: 4/7×17/18×7/4×18/7

Comments ( 2 )

  1. Giải đáp:
    \frac{4}{7} × \frac{17}{18} × \frac{7}{4} × \frac{18}{7}
    = \frac{4×17×7×18}{7×18×4×7}
    = \frac{4×17×7×18}{4×7×7×18}
    = \frac{17}{7}
    = 2\frac{3}{7}
    Chúc học tốt!!!
     
     

  2. 4/7 \times 17/18 \times 7/4 \times 18/7
    ={4 \times 17 \times 7 \times 18}/{7 \times 18 \times 4 \times 7}
    =17/7

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