大家看看第八题是怎么求导,不会做啊。
4个回答
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x^3-1
= x(x^2-x+2) +x^2-2x -1
= x(x^2-x+2) +(x^2-x+2) -x -3
y = (x^3-1)/(x^2-x+2)
= x +1 - (x+3)/(x^2-x+2)
dy/dx
= 1 - [ (x^2-x+2) d/dx (x+3) - (x+3)d/dx(x^2-x+2)]/(x^2-x+2)^2
= 1 - [ (x^2-x+2) - (x+3)(2x-1)]/(x^2-x+2)^2
=1- [ x^2-x+2 - 2x^2-5x+3]/(x^2-x+2)^2
=1- [-x^2-6x+5]/(x^2-x+2)^2
=1 + (x^2+6x-5)/(x^2-x+2)^2
= x(x^2-x+2) +x^2-2x -1
= x(x^2-x+2) +(x^2-x+2) -x -3
y = (x^3-1)/(x^2-x+2)
= x +1 - (x+3)/(x^2-x+2)
dy/dx
= 1 - [ (x^2-x+2) d/dx (x+3) - (x+3)d/dx(x^2-x+2)]/(x^2-x+2)^2
= 1 - [ (x^2-x+2) - (x+3)(2x-1)]/(x^2-x+2)^2
=1- [ x^2-x+2 - 2x^2-5x+3]/(x^2-x+2)^2
=1- [-x^2-6x+5]/(x^2-x+2)^2
=1 + (x^2+6x-5)/(x^2-x+2)^2
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初中生,或者学渣……鉴定完毕
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放屁,我只是没想那么简单,想复杂了
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