Mathematica中的程序我的计算程序为Solve[-(1/y^2) + 0.25 + (15^5/Pi^4)[6[1 - 0.2^5]*0.2^5 + 4[16*Cos[0.1*Pi]/Pi^2 - 16*Cos[0.02*Pi] + Cos[0.04*Pi] - Cos[0.2*Pi]]] == 0,y]算不出最终y的值,着是为什么?
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![Mathematica中的程序我的计算程序为Solve[-(1/y^2) + 0.25 + (15^5/Pi^4)[6[1 - 0.2^5]*0.2^5 + 4[16*Cos[0.1*Pi]/Pi^2 - 16*Cos[0.02*Pi] + Cos[0.04*Pi] - Cos[0.2*Pi]]] == 0,y]算不出最终y的值,着是为什么?](/uploads/image/z/8634394-10-4.jpg?t=Mathematica%E4%B8%AD%E7%9A%84%E7%A8%8B%E5%BA%8F%E6%88%91%E7%9A%84%E8%AE%A1%E7%AE%97%E7%A8%8B%E5%BA%8F%E4%B8%BASolve%5B-%281%2Fy%5E2%29+%2B+0.25+%2B+%2815%5E5%2FPi%5E4%29%5B6%5B1+-+0.2%5E5%5D%2A0.2%5E5+%2B+4%5B16%2ACos%5B0.1%2APi%5D%2FPi%5E2+-+16%2ACos%5B0.02%2APi%5D+%2B+Cos%5B0.04%2APi%5D+-+Cos%5B0.2%2APi%5D%5D%5D+%3D%3D+0%2Cy%5D%E7%AE%97%E4%B8%8D%E5%87%BA%E6%9C%80%E7%BB%88y%E7%9A%84%E5%80%BC%2C%E7%9D%80%E6%98%AF%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
Mathematica中的程序我的计算程序为Solve[-(1/y^2) + 0.25 + (15^5/Pi^4)[6[1 - 0.2^5]*0.2^5 + 4[16*Cos[0.1*Pi]/Pi^2 - 16*Cos[0.02*Pi] + Cos[0.04*Pi] - Cos[0.2*Pi]]] == 0,y]算不出最终y的值,着是为什么?
Mathematica中的程序
我的计算程序为
Solve[-(1/y^2) +
0.25 + (15^5/Pi^4)[
6[1 - 0.2^5]*0.2^5 +
4[16*Cos[0.1*Pi]/Pi^2 - 16*Cos[0.02*Pi] + Cos[0.04*Pi] -
Cos[0.2*Pi]]] == 0,y]
算不出最终y的值,着是为什么?
Mathematica中的程序我的计算程序为Solve[-(1/y^2) + 0.25 + (15^5/Pi^4)[6[1 - 0.2^5]*0.2^5 + 4[16*Cos[0.1*Pi]/Pi^2 - 16*Cos[0.02*Pi] + Cos[0.04*Pi] - Cos[0.2*Pi]]] == 0,y]算不出最终y的值,着是为什么?
输入:Solve[(1/Pi^4)*(15^5*(0.2^5*6*(1 - 0.2^5) +
4*(-16*Cos[0.02*Pi] + Cos[0.04*Pi] - Cos[0.2*Pi] +
(16*Cos[0.1*Pi])/Pi^2))) - 1/y^2 + 0.25 == 0,y]
输出:{{y -> 0.- 0.00150051 I},{y -> 0.+ 0.00150051 I}}
原因:方括号[]只能用在函数中,改变运算先后顺序应该用小括号.