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2009-12-28T23:21:34+01:00
Y=5ln10x
y’=(5ln 10x)’ (10x)’=5/10x * 10= 50/10x=5/x

y=ln 30/x+3
y’=(ln 30/x+3)’ (30/x+3)’=1/(30/x+3) * -30/ (x+3)^2= x+3/30 * -30/(x+3)^2
=-1/x+3

y=3ln 5/x-2
y’= (3ln 5/x-2)’*(5/x-2)’=3/(5/(x-2))* -5/ (x-2)^2=3(x-2)/5 * -5/ (x-2)^2=-3/ x-2