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计算
\(( - \frac{4}{5}) + \frac{3}{4}\).
参考答案:\( -\frac{1}{20}\)
解析:
\(( - \frac{4}{5}) + \frac{3}{4}\)\( = - \frac{4}{5} + \frac{3}{4}\)\( = - \frac{{16}}{{20}} + \frac{{15}}{{20}}\)\( = - \frac{1}{{20}}\).
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