1+2+3+4+.+100=5050 求1+2+3+4+.+n=__继续观察1³=1² ,1³+2³=3² ,1³+2³+3³=6² ,1³+2³+3³+4³=10² .求 1³+2³+3³+.+n³=___
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![1+2+3+4+.+100=5050 求1+2+3+4+.+n=__继续观察1³=1² ,1³+2³=3² ,1³+2³+3³=6² ,1³+2³+3³+4³=10² .求 1³+2³+3³+.+n³=___](/uploads/image/z/11671044-60-4.jpg?t=1%2B2%2B3%2B4%2B.%2B100%3D5050+%E6%B1%821%2B2%2B3%2B4%2B.%2Bn%3D__%E7%BB%A7%E7%BB%AD%E8%A7%82%E5%AF%9F1%26%23179%3B%3D1%26%23178%3B+%2C1%26%23179%3B%2B2%26%23179%3B%3D3%26%23178%3B+%2C1%26%23179%3B%2B2%26%23179%3B%2B3%26%23179%3B%3D6%26%23178%3B+%2C1%26%23179%3B%2B2%26%23179%3B%2B3%26%23179%3B%2B4%26%23179%3B%3D10%26%23178%3B+.%E6%B1%82+1%26%23179%3B%2B2%26%23179%3B%2B3%26%23179%3B%2B.%2Bn%26%23179%3B%3D___)
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