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平面形狀的圖形,不管什麼形狀(只要是平面的),等比例縮小或者放大時,面積是平方關係:一個長方形長5cm,寬3cm ===>原長方形的面積為:5X3 = 15㎝²;按3:1放大以後的圖形肯定還是長方形,並且面積為15 X 9 =13…
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