求f(x)=(x-1)*(x-2)^2*(x-3)^3*(x-4)^4 的拐点.
求f(x)=(x-1)*(x-2)^2*(x-3)^3*(x-4)^4的拐点.求f(x)=(x-1)*(x-2)^2*(x-3)^3*(x-4)^4的拐点....
求f(x)=(x-1)*(x-2)^2*(x-3)^3*(x-4)^4
的拐点.求f(x)=(x-1)*(x-2)^2*(x-3)^3*(x-4)^4
的拐点. 展开
的拐点.求f(x)=(x-1)*(x-2)^2*(x-3)^3*(x-4)^4
的拐点. 展开
1个回答
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f′(x)=(x-2)²(x-3)³(x-4)^4+(x-1)2(x-2)(x-3)³(x-4)^4+(x-1)(x-2)²3(x-3)²(x-4)^4+(x-1)(x-2)²(x-3)³4(x-4)³
约去公因式(x-2)(x-3)²(x-4)³后(3个拐点2.3.4)
=(x-2)(x-3)(x-4)+(x-1)(x-3)(x-4)+(x-1)(x-2)(x-4)+(x-1)(x-2)(x-3)
=(2x-5)(x-2)(x-3)+(2x-5)(x-1)(x-4)
=(2x-5)(2x²-10x+10)
得拐点5/2,(5±√5)/2
约去公因式(x-2)(x-3)²(x-4)³后(3个拐点2.3.4)
=(x-2)(x-3)(x-4)+(x-1)(x-3)(x-4)+(x-1)(x-2)(x-4)+(x-1)(x-2)(x-3)
=(2x-5)(x-2)(x-3)+(2x-5)(x-1)(x-4)
=(2x-5)(2x²-10x+10)
得拐点5/2,(5±√5)/2
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追问
不应该求二阶导嘛😀
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又不问凹凸,干嘛要二阶?
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