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

Toán Lớp 6: cho biểu thức p=1/9+1/10+…+1/78+1/79 chứng tỏ: p>28/9

Toán Lớp 6: cho biểu thức p=1/9+1/10+…+1/78+1/79 chứng tỏ: p>28/9

Comments ( 1 )

  1. Sửa lại đề : P=1/9+1/10+…+1/78+1/79 chứng tỏ: P<28/9
    Ta có :
    1/10+1/11+…..+1/19<1/10+1/10+….+1/10=1
    1/20+1/21+….+1/39<1/20+1/20+….+1/20=1
    1/40+1/41+….+1/59<1/40+1/40+…..+1/40=1
    =>P<28/9
    Vậy P<28/9

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