请问一题求导题
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y=(x-1)(x-2)(x-3);求y'=?
解:用对数求导法:lny=ln(x-1)+ln(x-2)+ln(x-3);
y'/y=1/(x-1)+1/(x-2)+1/(x-3);
∴y'=y[1/(x-1)+1/(x-2)+1/(x-3)]=(x-1)(x-2)(x-3)[1/(x-1)+1/(x-2)+1/(x-3)];
解:用对数求导法:lny=ln(x-1)+ln(x-2)+ln(x-3);
y'/y=1/(x-1)+1/(x-2)+1/(x-3);
∴y'=y[1/(x-1)+1/(x-2)+1/(x-3)]=(x-1)(x-2)(x-3)[1/(x-1)+1/(x-2)+1/(x-3)];
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y=(x-1)(x-2)(x-3)
y'=(x-1)'(x-2)(x-3)+(x-1)(x-2)'(x-3)+(x-1)(x-2)(x-3)'
=(x-2)(x-3)+(x-1)(x-3)+(x-1)(x-2)
=3x²-12x+11
y'=(x-1)'(x-2)(x-3)+(x-1)(x-2)'(x-3)+(x-1)(x-2)(x-3)'
=(x-2)(x-3)+(x-1)(x-3)+(x-1)(x-2)
=3x²-12x+11
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dy=(x-2)(x-3)dx+(x-1)(x-3)dx+(x-1)(x-2)dx
y'=(x-2)(x-3)+(x-1)(x-3)+(x-1)(x-2)
y'=(x-2)(x-3)+(x-1)(x-3)+(x-1)(x-2)
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