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s=πr^2-a^2 c=4a+2πr
1、正方形的面積:邊長=邊長,比值不是個定值,不成正比例,所以錯誤. 2、周長:邊長=4,比值是個非零的定值,所以成正比例,正確. 願意解疑答惑.如果明白,並且解决了你的問題,
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