Question

estimate the difference using benchmarks.
\\(\frac{7}{12} - \frac{4}{9}\\)
0
\\(\frac{1}{2}\\)
1

Explanation:

Step1: 估算分数$\frac{7}{12}$的基准值

$\frac{7}{12}$接近$\frac{6}{12}=\frac{1}{2}$，即$\frac{7}{12}\approx\frac{1}{2}$

Step2: 估算分数$\frac{4}{9}$的基准值

$\frac{4}{9}$接近$\frac{4.5}{9}=\frac{1}{2}$，即$\frac{4}{9}\approx\frac{1}{2}$

Step3: 计算估算的差值

$\frac{1}{2}-\frac{1}{2}=0$

Answer:

0