d第五题

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d第五题
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d第五题

d第五题

d第五题
上下同除ad,得b/d=c/a
同除bd,得a/d=c/b
同除ac,得b/c=d/a

a/c=d/b,a/d=c/b,ab/cd=1,cd/ab=1,abc=c^2d

a/c=d/b;a/d=c/b;b/c=d/a;b/d=c/a;ab:cd=1:1