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高中數(shù)學(xué)人教a版選修2-2教學(xué)課件:2、1-2-2-1(編輯修改稿)

2024-12-23 19:03 本頁面
 

【文章內(nèi)容簡介】 3 x3) ′ = ( 15 x4- 12 x2)(4 x5+ 3 x3) + (3 x5- 4 x3) ( 20 x4+ 9 x2) = 60 x9- 48 x7+ 45 x7- 36 x5+ 60 x9- 80 x7+ 27 x7- 36 x5= 120 x9- 56 x7- 72 x5. 解法 2 : ∵ y = 12 x10- 7 x8- 12 x6 ∴ y ′ = 120 x9- 56 x7- 72 x5. [點(diǎn)評 ] ,通常先展開再求導(dǎo)更簡便. 2. 含根號(hào)的函數(shù)求導(dǎo)一般先化為分?jǐn)?shù)指數(shù)冪 , 再求導(dǎo) . ( 3) y ′ = (33x4+ 4 x3) ′ = (3 x43) ′ + (4 x32) ′ ( 2) 求 y =1x +2x 2 +3x 3 的導(dǎo)數(shù). (1)求下列函數(shù)的導(dǎo)數(shù) . ① y= x2sinx ② y= x2(x2- 1) [ 解析 ] ( 1) ① y ′ = ( x2si n x ) ′ = ( x2) ′ sin x + x2( si n x ) ′ = 2 x sin x + x2c os x . ② y ′ = [ x2( x2- 1) ] ′ = ( x2) ′ ( x2- 1) + x2( x2- 1) ′ = 2 x ( x2- 1) + x22 x = 4 x3- 2 x . ( 2) y ′ =??????1x+2x2 +3x3 ′ =??????1x+ 2 x- 2+ 3 x- 3′ =-1x
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