✨ คำตอบที่ดีที่สุด ✨
方法一：級數求解
（0.3+0.03）+（0.03+0.0003）+（0.003+0.000003）+⋯⋯=？
方法二：可以試著用直式加法加加看，猜想答案。
Mathematics
มัธยมปลาย
เคลียร์แล้ว
想問第三題
10.(1)求0.9+0.099+0.00999+0.0009999+…
(2)求0.5+0.055+0.00555+0.0005555+
(3)求0.33+0.0303+0.003003+0.00030003+
คำตอบ
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