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你好:圓環面積=外圓面積-內圓面積外圓面積=3.14×5²;=78.5(平方釐米)內圓面積=3.14×3²;=28.26(平方釐米)圓環面積=78.5-28.26=50.24(平方釐米)也可以這樣算:3.14×(5²;-3²;)=3.14×16=5…
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