观察两个算式:(a+b+c)^2与a ^2+b^2+c^2+2ab+2bc+2ca.1、这两个算式是否相等?请证明.2、根据上面的结论,你能写出下面两个算式的结果吗?①(a+2b+1)^2②(x-y+3)^2
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![观察两个算式:(a+b+c)^2与a ^2+b^2+c^2+2ab+2bc+2ca.1、这两个算式是否相等?请证明.2、根据上面的结论,你能写出下面两个算式的结果吗?①(a+2b+1)^2②(x-y+3)^2](/uploads/image/z/8684964-36-4.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%A4%E4%B8%AA%E7%AE%97%E5%BC%8F%3A%28a%2Bb%2Bc%29%5E2%E4%B8%8Ea+%5E2%2Bb%5E2%2Bc%5E2%2B2ab%2B2bc%2B2ca.1%E3%80%81%E8%BF%99%E4%B8%A4%E4%B8%AA%E7%AE%97%E5%BC%8F%E6%98%AF%E5%90%A6%E7%9B%B8%E7%AD%89%3F%E8%AF%B7%E8%AF%81%E6%98%8E.2%E3%80%81%E6%A0%B9%E6%8D%AE%E4%B8%8A%E9%9D%A2%E7%9A%84%E7%BB%93%E8%AE%BA%2C%E4%BD%A0%E8%83%BD%E5%86%99%E5%87%BA%E4%B8%8B%E9%9D%A2%E4%B8%A4%E4%B8%AA%E7%AE%97%E5%BC%8F%E7%9A%84%E7%BB%93%E6%9E%9C%E5%90%97%3F%E2%91%A0%EF%BC%88a%2B2b%2B1%EF%BC%89%5E2%E2%91%A1%28x-y%2B3%29%5E2)
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