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

Toán Lớp 6: 1/5+1/13+1/25+1/41+1/61+1/85+1/113<1/2

Toán Lớp 6: 1/5+1/13+1/25+1/41+1/61+1/85+1/113<1/2

Comments ( 2 )

  1. A=1/5+1/(13)+1/(25)+1/(41)+1/(61)+1/(85)+1/(113)

    <=>A=1/5+(1/(13)+1/(25)+1/(41))+(1/(61)+1/(85)+1/(113))

    <=>A<1/5+(1/(12)+1/(12)+1/(12))+(1/(60)+1/(60)+1/(60))

    <=>A<1/5+3/(12)+3/(60)

    <=>A<1/5+1/4+1/(20)

    <=>A<4/(20)+5/(20)+1/(20)

    <=>A<(4+5+1)/(20)

    <=>A<(10)/(20)

    <=>A<1/2

    Vậy A<1/2

     

  2.                                Bài làm

    Đặt : 

    Vậy : 

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