快呀,7点之前没有我就关了,n个

快呀,7点之前没有我就关了,n个
一块等腰三角尺,三角尺的等腰两面长a,中间有圆孔,圆孔的半径是r,三角尺的厚度是h,这块三角板的体积v是多少?若a=6cm,r=0.5cm,h=0.2cm,求V的值(派取3).
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