1题合并同类项.2题化简同类项,求值.合并同类项:1、m+m+n-n²-n²化简同类项:求值:1、5x²-3x³-x-4+3x³+2x-9,其中x=-22、a³-a²b+ab²+a²b-ab²+b³,其中a=1,b=-3
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![1题合并同类项.2题化简同类项,求值.合并同类项:1、m+m+n-n²-n²化简同类项:求值:1、5x²-3x³-x-4+3x³+2x-9,其中x=-22、a³-a²b+ab²+a²b-ab²+b³,其中a=1,b=-3](/uploads/image/z/3693411-27-1.jpg?t=1%E9%A2%98%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9.2%E9%A2%98%E5%8C%96%E7%AE%80%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E6%B1%82%E5%80%BC.%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9%EF%BC%9A1%E3%80%81m%2Bm%2Bn-n%26%23178%3B-n%26%23178%3B%E5%8C%96%E7%AE%80%E5%90%8C%E7%B1%BB%E9%A1%B9%EF%BC%9A%E6%B1%82%E5%80%BC%EF%BC%9A1%E3%80%815x%26%23178%3B-3x%26%23179%3B-x-4%2B3x%26%23179%3B%2B2x-9%2C%E5%85%B6%E4%B8%ADx%3D-22%E3%80%81a%26%23179%3B-a%26%23178%3Bb%2Bab%26%23178%3B%2Ba%26%23178%3Bb-ab%26%23178%3B%2Bb%26%23179%3B%2C%E5%85%B6%E4%B8%ADa%3D1%2Cb%3D-3)
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