f(x)=x^4/2-3x²+4xf'(x)=2x³-6x+4=0x³-3x+2=0x³-x²+x²-x-2x+2=0x²(x-1)+x(x-1)-2(x-1)=0(x-1)(x²+x-2)=0(x-1)(x+2)(x-1)=0(x-1)²(x+2)=0x=1 或x=-2f(1)=3/2 f(-2)=-12...
1已知函数.f(x)=3ax^4-2(3a+1)x^2+4x
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