braintestx\y-=4 y'=[(4+x)'(4-x)-(4+x)(4-x)']/(4-x)(4-x) y'=[(4-x)+(4+x)]/(4-x)(4-x) 把x=2代入,求得曲线在点(2,3)处的切线斜率为2... 149
braintestx\y-=4 y'=[(4+x)'(4-x)-(4+x)(4-x)']/(4-x)(4-x) y'=[(4-x)+(4+x)]/(4-x)(4-x) 把x=2代入,求得曲线在点(2,3)处的切线斜率为2... 757