( )=( )=( )+=-( )=1

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$\frac {1} {8}$ ×( )= $\frac {1} {13}$ ÷( )=( )+ $\frac {8} {21}$ = $\frac {29} {4}$ -( )=1

参考答案：↓

解析： $\frac {1} {8}$ ×( 8 )= $\frac {1} {13}$ ÷( $\frac {1} {13}$ )=( $\frac {13} {21}$ )+ $\frac {8} {21}$ = $\frac {29} {4}$ -( $\frac {25} {4}$ )=1