5/8*69又10/17+1/8*50+7/8*5/17
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5/8*69又10/17+1/8*50+7/8*5/17
5/8*69又10/17+1/8*50+7/8*5/17
5/8*69又10/17+1/8*50+7/8*5/17
原式=[5*(69*17+10)+1*50*17+7*5]/(8*17)=(5915+850+35)/136=6800/136=50