（-m-n）（m+n）=　　．

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\frac{4 025}{2 014}

\frac{4 026}{2 014}

\frac{4 027}{2 014}

\frac{4 028}{2 014}

\frac{1}{2} + \frac{1}{4} + \frac{1}{6} + \dots + \frac{1}{20}

1 + \frac{1}{3} + \frac{1}{5} + \dots + \frac{1}{19}

1 + \frac{1}{2} + \frac{1}{4} + \dots + \frac{1}{18}

\frac{1}{2} + \frac{1}{2^{2}} + \frac{1}{2^{3}} + \dots + \frac{1}{2^{10}}

1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4}

1 + \frac{1}{2} + \frac{1}{3 \times 2} + \frac{1}{4 \times 3 \times 2}

1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \frac{1}{5}

1 + \frac{1}{2} + \frac{1}{3 \times 2} + \frac{1}{4 \times 3 \times 2} + \frac{1}{5 \times 4 \times 3 \times 2}

2^{4} \times 1 \times 3 \times 5 \times 7 = 5 \times 6 \times 7 \times 8

2^{5} \times 1 \times 3 \times 5 \times 7 \times 9 = 5 \times 6 \times 7 \times 8 \times 9

2^{4} \times 1 \times 3 \times 5 \times 7 \times 9 = 6 \times 7 \times 8 \times 9 \times 10

2^{5} \times 1 \times 3 \times 5 \times 7 \times 9 = 6 \times 7 \times 8 \times 9 \times 10

{(\frac{1}{3})}^{\frac{2}{3}} < {(\frac{1}{5})}^{\frac{2}{3}} < {(\frac{1}{2})}^{\frac{1}{3}}

{(\frac{1}{3})}^{\frac{1}{3}} < {(\frac{1}{2})}^{\frac{2}{3}} < {(\frac{1}{5})}^{\frac{2}{3}}

{(\frac{1}{5})}^{\frac{2}{3}} < {(\frac{1}{2})}^{\frac{1}{3}} < {(\frac{1}{2})}^{\frac{2}{3}}

{(\frac{1}{5})}^{\frac{2}{3}} < {(\frac{1}{2})}^{\frac{2}{3}} < {(\frac{1}{2})}^{\frac{1}{3}}

1 < 2 - \frac{1}{2 - 1}

1 + \frac{1}{2^{2}} < 2 - \frac{1}{2^{2} - 1}

1 + \frac{1}{2^{2}} + \frac{1}{3^{2}} < 2 - \frac{1}{2^{2} - 1}

1 + \frac{1}{2^{2}} + \frac{1}{3^{2}} + \frac{1}{4^{2}} < 2 - \frac{1}{2^{2} - 1}