20.4x的四次方-x³-x²-x-21=0如题,求X
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20.4x的四次方-x³-x²-x-21=0如题,求X
20.4x的四次方-x³-x²-x-21=0
如题,求X
20.4x的四次方-x³-x²-x-21=0如题,求X
X1=1.04443252708148
X2=-0.99518086313421
X3=-0.000116028052065-0.995183938591254i
X4=-0.000116028052065+0.995183938591254i