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复制本帖HTML代码
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高亮:
今天贴
X 昨天贴
X 前天贴
X |
两行就能把根解出来:
>> syms x y
>> solve('x^3+x-y')
ans =
[ 1/6*(108*y+12*(12+81*y^2)^(1/2))^(1/3)-2/(108*y+12*(12+81*y^2)^(1/2))^(1/3)]
[ -1/12*(108*y+12*(12+81*y^2)^(1/2))^(1/3)+1/(108*y+12*(12+81*y^2)^(1/2))^(1/3)+1/2*i*3^(1/2)*(1/6*(108*y+12*(12+81*y^2)^(1/2))^(1/3)+2/(108*y+12*(12+81*y^2)^(1/2))^(1/3))]
[ -1/12*(108*y+12*(12+81*y^2)^(1/2))^(1/3)+1/(108*y+12*(12+81*y^2)^(1/2))^(1/3)-1/2*i*3^(1/2)*(1/6*(108*y+12*(12+81*y^2)^(1/2))^(1/3)+2/(108*y+12*(12+81*y^2)^(1/2))^(1/3))].
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