(a+9b+38)/(a+3b+19) если a/b=3

Question

(a+9b+38)/(a+3b+19) если a/b=3

Answer 1

A / B = 3 
A = 3B 
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1) A + 9B + 38 = 3B + 9B + 38 = 12B + 38 = 2 * ( 6B + 19 )
2) A + 3B + 19 = 3B + 3B + 19 = 6B + 19 
3) [ 2 * ( 6B + 19 ) ] / ( 6B + 19 ) = 2 
ОТВЕТ 2