I assume this is :
(12 b^4c^5)/(18 b^8c^9) ... remember that.... an / am = a n-m .. and...... a-b = 1/ab....so we have
(12/18) x (b4 / b8) x (c5 / c9) =
(2/3) x (b-4 ) x ( c-4) =
(2/3) x (1/b4) x (1/c4) =
(2) / (3b4c4)
CPhill: Are the 2 results(yours & Guest's) equivalent? If not, then one of them is wrong. The Guest's answer was arrived at by WolframAlpha Computing Engine.
Anon, CPhill know how to think.
Wolframaplha is a computer it do not know how to think.
I was just thinking anon you are like wolframalpha you do not know how to think either so maybe I need to answer your question. The answers are not equivalent