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

Toán Lớp 5: (1-1/2) × (1-1/3) × (1-1/4) × (1-1/5) ×(1-1/6

Toán Lớp 5: (1-1/2) × (1-1/3) × (1-1/4) × (1-1/5) ×(1-1/6

Comments ( 2 )

  1. (1- 1/2) xx (1- 1/3) xx (1- 1/4) xx(1- 1/5) xx(1-1/6)
    =(2/2 – 1/2) xx (3/3 – 1/3) xx (4/4 – 1/4 ) xx (5/5 – 1/5) xx(6/6 -1/6)
    =1/2 xx 2/3 xx 3/4 xx 4/5 xx 5/6
    =(1xx2xx3xx4xx5)/(2xx3xx4xx5xx6)
    Đến bước này thì triệt tiêu
    =1/6
     

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