设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b (2)求f(x)的单调区间设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b(2)求f(x)的单调区间
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![设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b (2)求f(x)的单调区间设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b(2)求f(x)的单调区间](/uploads/image/z/12560664-48-4.jpg?t=%E8%AE%BEx%3D1%2Cx%3D2%E6%98%AFf%28x%29%3Dax%26%23179%3B%2Bbx%26%23178%3B%2B6x%2B1%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%9E%81%E5%80%BC%E7%82%B9.%E6%B1%82%281%29a%2Cb+%282%29%E6%B1%82f%28x%29%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B4%E8%AE%BEx%3D1%2Cx%3D2%E6%98%AFf%28x%29%3Dax%26%23179%3B%2Bbx%26%23178%3B%2B6x%2B1%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%9E%81%E5%80%BC%E7%82%B9.%E6%B1%82%281%29a%2Cb%282%29%E6%B1%82f%28x%29%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B4)
设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b (2)求f(x)的单调区间设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b(2)求f(x)的单调区间
设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b (2)求f(x)的单调区间
设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.
求(1)a,b
(2)求f(x)的单调区间
设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b (2)求f(x)的单调区间设x=1,x=2是f(x)=ax³+bx²+6x+1的两个极值点.求(1)a,b(2)求f(x)的单调区间
(1)3a+2b+6=0
12a+4b+6=0
a=1 b=-4.5
(2)(1,2)为单减
别的区间为单增