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由題目中給出的圖中,我們可以看出a、b、c構成三角形,且a、b是兩直角,c是斜邊,∴a2+b2=c2,a=2m,b=1.5m,c=2.5m,∵d=10m,S=cd,∴覆蓋在頂上的塑膠薄膜的面積S=cd=25m2,故答案為:25.
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