d^2y/dx^2 + y = 0最后因该是y=?,实在是一窍不通
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![d^2y/dx^2 + y = 0最后因该是y=?,实在是一窍不通](/uploads/image/z/14837398-70-8.jpg?t=d%5E2y%2Fdx%5E2+%2B+y+%3D+0%E6%9C%80%E5%90%8E%E5%9B%A0%E8%AF%A5%E6%98%AFy%3D%3F%2C%E5%AE%9E%E5%9C%A8%E6%98%AF%E4%B8%80%E7%AA%8D%E4%B8%8D%E9%80%9A)
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d^2y/dx^2 + y = 0最后因该是y=?,实在是一窍不通
d^2y/dx^2 + y = 0
最后因该是y=?,实在是一窍不通
d^2y/dx^2 + y = 0最后因该是y=?,实在是一窍不通
y=-y'' d^2y/dx^2是二阶导的意思,d^2y是对y求两次导,dx^2是x一阶导的平方