已知方程2X^5-7X^4+8X^3-2X^2+6X+5=0有两个根是2-i,i,解此方程.
人气:123 ℃ 时间:2019-12-01 14:24:51
解答
Y(X)=X^5-3.5X^4+4X^3-X^2+3X+2.5=0 [X-(2+i)][X-(2-i)](X+i)(X-i)(X-X1)=0(X^2+1)[(X-2)-i][(X-2)+i](X-X1)=0(X^2+1)[(X-2)^2+1](X-X1)=0(X^2+1)(X^2-4X+5)(X-X1)=0(X^4-4X^3+6X^2-4X+5)(X-X1)=0X^5-4X^4 +6 X^3 - ...
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