一页数学题,求讲解.class="ikqb_img" src="http://f.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=b9ca01aae4cd7b89e93932853f146e9f/48540923dd54564eff95e559b1de9c82d0584fd9.jpg" esrc="http://f.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=627e3b7
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![一页数学题,求讲解.class=](/uploads/image/z/7120501-61-1.jpg?t=%E4%B8%80%E9%A1%B5%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E6%B1%82%E8%AE%B2%E8%A7%A3.class%3D%22ikqb_img%22+src%3D%22http%3A%2F%2Ff.hiphotos.baidu.com%2Fzhidao%2Fwh%253D600%252C800%2Fsign%3Db9ca01aae4cd7b89e93932853f146e9f%2F48540923dd54564eff95e559b1de9c82d0584fd9.jpg%22+esrc%3D%22http%3A%2F%2Ff.hiphotos.baidu.com%2Fzhidao%2Fwh%253D450%252C600%2Fsign%3D627e3b7)
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