Let a−2b+c=1, If f(x)=∣∣ ∣∣x+ax+2x+1x+bx+3x+2x+cx+4x+3∣∣ ∣∣, then:
if f(x)= ∣∣ ∣ ∣∣312a(x)b(x)c(x)g(x)h(x)k(x)∣∣ ∣ ∣∣,then f'(x)=∣∣ ∣ ∣∣312a′(x)b′(x)c′(x)g′(x)h′(x)k′(x)∣∣ ∣ ∣∣