{a:b:c=3:4:5 a+b+c=36

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{a:b:c=3:4:5 a+b+c=36
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{a:b:c=3:4:5 a+b+c=36
{a:b:c=3:4:5 a+b+c=36

{a:b:c=3:4:5 a+b+c=36
a:b:c=3:4:5
则a/3=b/4=c/5
所以b=4a/3
c=5a/3
代入a+b+c=36
a+4a/3+5a/3=36
4a=36
所以
a=9
b=4a/3=12
c=5a/3=15

a是9b12c15