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首先感谢李老师的热情帮助~~ 这个PPT中的第9页给出公式(1.5.9)。如果这个公式是正确的,则我的疑问就没有了,因为我原图中(4)式的右端项,第二项与第三项抵消了。但可疑的,这个公式(1.5.9)似乎并不正确。贴上来再麻烦李老师帮我看看: 0_1502119393399_7fd74579-5b34-4c15-ac3c-1cc3aae56236-image.png