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一般初中數學是通過配方得到這個結果的.高中數學中可以借助導數推導出這個公式.比如:ax^2+bx+c=f(x)(a>0 b>0)那麼它關於x的導函數是f“(x)=2ax+b 當f“(x1)=0且當任意x>x1時f”(x)>0當任意x
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