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懿信:這個圓柱的圓周長=125.6dm²;÷8dm=15.7dm半徑=15.7dm÷3.14÷2=2.5dm上下二個底的面積=(2.5dm)²;×3.14×2=39.25dm²;總表面積=125.6dm²;+39.25dm²;=164.85dm²;答:圓柱總…
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