F.2既Approximation and Errors問題!!急急急

[1].
-0.0203049 (Correct to 4 significant figures)
= -0.02030 [逢遇到 0. 00---- XXX ，前面一大堆 0 唔計；因為第 5個位係 4，唔洗進位，所以變左 0.02030]

[2]. 39.967 (Correct to 3 significant figures)
= 40.0 [因為第 4個位係 6，要進位，所以變左 40，但因為題目要 3 significant figures ，所以要加上 0 ]


[3]. 548.6 (Correct to 4 significant figures)
= 548.6 [個數字本身已有 4個位，唔洗搞其他野]

[4]. 30.047 (Correct to 4 significant figures)
= 30.05 [因為第 5個位係 7，要進位，所以變左 30.05]


[5]. 12.963 (Correct to 4 significant figures)
= 12.96 [因為第 5個位係 3，唔洗進位]

[6]. 12.963 (Correct to 3 significant figures)
= 13.0 [因為第 4個位係 6，要進位，所以變左 13，但因為題目要 3 significant figures ，所以要加上 0 ]