求曲线围成的面积求y²=2x,y=x-4所围成图形的面积.【为什么是(y+4)-y²/2,不是y²/2-(y+4)积分求面积有负号的话应该哪个减哪个大家的回答都好好,
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![求曲线围成的面积求y²=2x,y=x-4所围成图形的面积.【为什么是(y+4)-y²/2,不是y²/2-(y+4)积分求面积有负号的话应该哪个减哪个大家的回答都好好,](/uploads/image/z/11667943-55-3.jpg?t=%E6%B1%82%E6%9B%B2%E7%BA%BF%E5%9B%B4%E6%88%90%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%B1%82y%26%23178%3B%3D2x%2Cy%3Dx-4%E6%89%80%E5%9B%B4%E6%88%90%E5%9B%BE%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF.%E3%80%90%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%28y%2B4%29-y%26%23178%3B%2F2%2C%E4%B8%8D%E6%98%AFy%26%23178%3B%2F2-%28y%2B4%29%E7%A7%AF%E5%88%86%E6%B1%82%E9%9D%A2%E7%A7%AF%E6%9C%89%E8%B4%9F%E5%8F%B7%E7%9A%84%E8%AF%9D%E5%BA%94%E8%AF%A5%E5%93%AA%E4%B8%AA%E5%87%8F%E5%93%AA%E4%B8%AA%E5%A4%A7%E5%AE%B6%E7%9A%84%E5%9B%9E%E7%AD%94%E9%83%BD%E5%A5%BD%E5%A5%BD%EF%BC%8C)
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