y=(x+1)(x-1)(x-2)求导
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y=(x+1)(x-1)(x-2)求导
y' = (x+1)'(x-1)(x-2)+(x+1)(x-1)'(x-2)+(x+1)(x-1)(x-2)'
= 1*(x-1)(x-2)+(x+1)*1*(x-2)+(x+1)(x-1)*1
= ……
= 1*(x-1)(x-2)+(x+1)*1*(x-2)+(x+1)(x-1)*1
= ……