$$\frac{0.25\times0.25-0.24\times0.24}{0.49}=?$$
$0.01$
$$\frac{0.0625-0.24\times 0.24}{0.49}$$
$$\frac{0.0625-0.0576}{0.49}$$
$$\frac{0.0049}{0.49}$$
$$\frac{49}{4900}$$
$$\frac{1}{100}$$
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$\frac{1}{2 ^ {2} \cdot 5 ^ {2}} = 0.01$
