如图,小明房间窗户高a米,窗户装饰物由半径都为b米的两个四分之一圆组成.(1)请用代数式表示窗户能射阳光的面积;(2)若a=2,b=三分之二时,请求出窗户能射进阳光的面积的值.(π取3)
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![如图,小明房间窗户高a米,窗户装饰物由半径都为b米的两个四分之一圆组成.(1)请用代数式表示窗户能射阳光的面积;(2)若a=2,b=三分之二时,请求出窗户能射进阳光的面积的值.(π取3)](/uploads/image/z/9582269-5-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B0%8F%E6%98%8E%E6%88%BF%E9%97%B4%E7%AA%97%E6%88%B7%E9%AB%98a%E7%B1%B3%2C%E7%AA%97%E6%88%B7%E8%A3%85%E9%A5%B0%E7%89%A9%E7%94%B1%E5%8D%8A%E5%BE%84%E9%83%BD%E4%B8%BAb%E7%B1%B3%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80%E5%9C%86%E7%BB%84%E6%88%90.%EF%BC%881%EF%BC%89%E8%AF%B7%E7%94%A8%E4%BB%A3%E6%95%B0%E5%BC%8F%E8%A1%A8%E7%A4%BA%E7%AA%97%E6%88%B7%E8%83%BD%E5%B0%84%E9%98%B3%E5%85%89%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5a%3D2%2Cb%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C%E6%97%B6%2C%E8%AF%B7%E6%B1%82%E5%87%BA%E7%AA%97%E6%88%B7%E8%83%BD%E5%B0%84%E8%BF%9B%E9%98%B3%E5%85%89%E7%9A%84%E9%9D%A2%E7%A7%AF%E7%9A%84%E5%80%BC.%EF%BC%88%CF%80%E5%8F%963%EF%BC%89)
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