dingtemple
幼苗
共回答了19个问题采纳率:89.5% 举报
(50-x)^3=0.397^4(x-39)^4
令y=x-39,则x=y+39,方程化为:
(11-y)^3=0.397^4y^4
y^4+40.25668(y-11)^3=0
由四次方程公式解得:
y1=22.7286161090394
y2=-61.9352490040764
y3=-0.525023552481487-6.1471568333643i
y4=-0.525023552481487+6.1471568333643i
所以实根有两个:
X1=61.7286161090394
X2=-22.9352490040764
1年前
9