若直线y=kx与曲线y=x3-3x2+2x相切,试求k的值
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y=kx (1)
y=x^3-3x^2+2x (2)
y'=3x^2-6x+2
y'=k
=>
3x^2-6x+2-k =0 (5)
from (1) and (2)
kx =x^3-3x^2+2x
x=0 (4)
sub (4) into (5)
2-k=0
k=2
y=x^3-3x^2+2x (2)
y'=3x^2-6x+2
y'=k
=>
3x^2-6x+2-k =0 (5)
from (1) and (2)
kx =x^3-3x^2+2x
x=0 (4)
sub (4) into (5)
2-k=0
k=2
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