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

Toán Lớp 5: tính bằng cách thuận tiện 1/2 x 1/3+1/3 x 1/4+1/4 x 1/5+1/5 x 1/6

Toán Lớp 5: tính bằng cách thuận tiện
1/2 x 1/3+1/3 x 1/4+1/4 x 1/5+1/5 x 1/6

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    1/2 xx 1/3 + 1/3 xx 1/4 + 1/4 xx 1/5 + 1/5 xx 1/6
    = 1/2xx3 + 1/3xx4 + 1/4xx5 + 1/5xx6
    = 1/2 – 1/3 + 1/3 – 1/4 + 1/4 – 1/5 + 1/5 – 1/6
    = 1/2 – 1/6
    = 3/6 – 1/6
    = 1/3
    _______________________________________________
    Laura

  2. 1/2.1/3+1/3.1/4+1/4.1/5+1.5.1/6
    =1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
    =(1/3-1/3)+(1/4-1/4)+(1/5-1/5)+1/2-1/6
    =1/2-1/6
    =3/6-1/6
    =2/6=1/3
     

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