2014-II-11

16-06-2021 app.cch No Comments

Ans: A
Note that the maximum absolute error is

0.5 cm

. Then, the least possible area

$\begin{array}{cl} = & (8 - 0.5) \times (10 - 0.5) \\ = & 71.25 {cm}^{2} \end{array}$

And the greatest possible area

$\begin{array}{cl} = & (8 + 0.5) \times (10 + 0.5) \\ = & 89.25 {cm}^{2} \end{array}$

Therefore, $71.25 \leq x < 89.25$ .