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

Toán Lớp 5: Tính bằng cách thuận tiện nhất :1 1/2× 1 1/3 × 1 1/4 × 1 1/5 × 1 1/6 × 1 1/7 × 1 1/8 × 1 1/9 giúp mk với

Toán Lớp 5: Tính bằng cách thuận tiện nhất :1 1/2× 1 1/3 × 1 1/4 × 1 1/5 × 1 1/6 × 1 1/7 × 1 1/8
× 1 1/9
giúp mk với

Comments ( 2 )

  1. =3/2×4/3x…x10/9
    =3x4x…x10/2x3x…x9
    =10/2=5

  2. 1 1/2xx1 1/3xx1 1/4xx1 1/5xx 1 1/6xx 1 1/7 xx1 1/8xx1 1/9
    = 3/2xx4/3xx5/4xx6/5xx7/6xx/xx8/7xx9/8xx10/9
    =10/2
    =5
     

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