QUESTION IMAGE
Question
estimate the difference using benchmarks.
\\(\frac{5}{8} - \frac{1}{9}\\)
0
\\(\frac{1}{2}\\)
1
Step1: 估算第一个分数
$\frac{5}{8}$接近$\frac{1}{2}$(即$\frac{4}{8}$),且略大于$\frac{1}{2}$
Step2: 估算第二个分数
$\frac{1}{9}$接近0,远小于$\frac{1}{2}$
Step3: 计算估算差值
用$\frac{1}{2} - 0 = \frac{1}{2}$
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$\boldsymbol{\frac{1}{2}}$