通分,分解因数:
=a/x+x-ax-1
=(a-ax²)/x+(x-1)
=a(1-x²)/x+(x-1)
=a(1-x)(1+x)/x+(x-1)
=-a(x-1)(1+x)/x+(x-1)
=(x-1)[1-a(1+x)/x]
=[(x-1)/x][x-a(1+x)]
=[(x-1)/x][x-a-ax]
=[(x-1)/x][x-ax-a+1-1]
=[(x-1)/x][x(1-a)+(1-a)-1]
=[(x-1)(1-a)/x][x+1-1/(1-a)]
=(x-1)(1-a)[x-a/(1-a)]/x
这是求导步骤
f(x)求导就出来了啊