x^3+3x^2-1=0
x1=-2.87938524157182......
x2=-0.652703644666139......
x3=0.532088886237956......
2x^3+3x^2-1
=2X^3+2X^2+X^2-1
=2X^2(X+1)+(X+1)(X-1)
=(X+1)(2X^2+X-1)
=(X+1)(2X-1)(X+1)=0
所以x+1=0 X=-1
2X-1=0 X=1/2
【】
0.4753
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