(3)數學-估算

(a)
161 / 9.31 + 171 / 7.64
= 17.2932 + 22.3822
= 40 (corr. to 2 sig. fig.)

(b)
(i) 161 / 9.31 = 17 (corr. to 2 sig. fig), 171 / 7.64 = 22 (corr. to sig. fig)
(ii) Sum = 17 + 22 = 39

(c)
No, the answers are not the same.
True value = 39.675432......
So, the answer in (a) is closer to the exact value.

2007-03-26 22:12:34 補充：
The question requires "2 significant figures", not "2 decimal places". So, the first answer seems not quite correct.

(a)39.68
(b)(i)17.29, 22.38
(b)(ii)39.67
(c)(a)部和(b)(ii)部的答案並不相同，(a)部較接近真確值。