计算：(1)/(3)×(3)/(5)+1(5)/(7)-(5)/(9)×(5)/(7)1-(5)/(7)×(21)/(25)(1)/(2)+(5)/(4)×(4)/(5)(1)/(6)×（5-(2)/(3)）(7)/(8)×7+(3)/(8)．

计算：
$\frac{1}{3}$×$\frac{3}{5}$+1
$\frac{5}{7}$-$\frac{5}{9}$×$\frac{5}{7}$
1-$\frac{5}{7}$×$\frac{21}{25}$
$\frac{1}{2}$+$\frac{5}{4}$×$\frac{4}{5}$
$\frac{1}{6}$×（5-$\frac{2}{3}$）
$\frac{7}{8}$×7+$\frac{3}{8}$．

参考答案与解析：

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