若(x+3)(x+M)=x²+kx-15,则K+M的值为( )A 14 B 13 C 12 D11已知a²+a-3=0,那么a²(a+4)的值是( )A9 B-12 C-18 D-15第一题的选择改为 A -3 B 5 C-2 D-7
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![若(x+3)(x+M)=x²+kx-15,则K+M的值为( )A 14 B 13 C 12 D11已知a²+a-3=0,那么a²(a+4)的值是( )A9 B-12 C-18 D-15第一题的选择改为 A -3 B 5 C-2 D-7](/uploads/image/z/5209723-19-3.jpg?t=%E8%8B%A5%EF%BC%88x%2B3%EF%BC%89%28x%2BM%29%3Dx%26sup2%3B%2Bkx-15%2C%E5%88%99K%2BM%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89A+14+B+13+C+12+D11%E5%B7%B2%E7%9F%A5a%26sup2%3B%EF%BC%8Ba%EF%BC%8D3%EF%BC%9D0%2C%E9%82%A3%E4%B9%88a%26sup2%3B%EF%BC%88a%EF%BC%8B4%EF%BC%89%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88+%EF%BC%89A9+B%EF%BC%8D12+C%EF%BC%8D18+D%EF%BC%8D15%E7%AC%AC%E4%B8%80%E9%A2%98%E7%9A%84%E9%80%89%E6%8B%A9%E6%94%B9%E4%B8%BA+A+-3+B+5+C-2+D-7)
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