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• d^2y/dx^2的例题

• d*2y/dx*2

• d^2y/dx^2=d/dx(dy/dx)

• d^2y/dx^2=dt/dx

• d^2y/dx^2-y=0

• d^2y/dx^2+w^2y=0

• d2y/dx2=-d2x/dy2/(dx/dy)3

• d^2y/dx^2公式推导

• d^2y/dx^2计算例题

• d^2y/dx^3

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