若a/b=c/d=e/f=3,(3b+d-2f+3≠0),则(3a+c-2e+9)/(3b+d-2f+3)=?
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若a/b=c/d=e/f=3,(3b+d-2f+3≠0),则(3a+c-2e+9)/(3b+d-2f+3)=?
若a/b=c/d=e/f=3,(3b+d-2f+3≠0),则(3a+c-2e+9)/(3b+d-2f+3)=?
若a/b=c/d=e/f=3,(3b+d-2f+3≠0),则(3a+c-2e+9)/(3b+d-2f+3)=?
因为 a/b=c/d=e/f=3,
所以 (3a+c--2e+9)/(3b+d--2f+3)=a/b=3(等比的性质).
3,(9b+3d-6f+9)/(3b+d-2f+3)=3(3b+d-2f+3)/(3b+d-2f+3)=3将a,c,e用b,d,f表示出来,然后化解就行了。