1除以x+2除以y+3除以z=5,3除以x+2除以y+1除以z=7,则求(1除以x+1除以y+1除以z)的值

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1除以x+2除以y+3除以z=5,3除以x+2除以y+1除以z=7,则求(1除以x+1除以y+1除以z)的值1除以x+2除以y+3除以z=5,3除以x+2除以y+1除以z=7,则求(1除以x+1除以y

1除以x+2除以y+3除以z=5,3除以x+2除以y+1除以z=7,则求(1除以x+1除以y+1除以z)的值
1除以x+2除以y+3除以z=5,3除以x+2除以y+1除以z=7,则求(1除以x+1除以y+1除以z)的值

1除以x+2除以y+3除以z=5,3除以x+2除以y+1除以z=7,则求(1除以x+1除以y+1除以z)的值
最终结果等于4
1/x+2/y+3/z=5 (1) 3/x+2/y+1/z=7 (2) 用(1)-(2)得出1/z=1/x-1 (3) 把(3)代入(2)得出2/x=4-1/y (4) 把(3)和(4)分别代入所求结果中就可以了