计算。
5/9+(3/4-1/2)  1/10+3/8-2/53/5-(2/15+1/3)

【参考答案】

5/9+(3/4-1/2) 1/10+3/8-2/5 3/5-(2/15+1/3)
=5/9+1/4 =19/4......

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