1.当x→0时下列变量中()是无穷小量A.y=Inx B.y=cosx C.y=e^x D.y=x^2 下列函数中是奇函数的是 A y=(e^x+e^-x)/2 B...
\u4e0b\u9762\u51fd\u6570\u4e2d\uff0c\u80fd\u591f\u662f\u5fae\u5206\u65b9\u7a0by''+y'=0\u7684\u89e3\u7684\u51fd\u6570\u662f A y=x B y=cosx+1 C y=sinx D y=e^xy''+y'=0
y''=-y'
dln|y'|=-dx
y'=Ce^(-x)
y=C0e^(-x)+C1 C0=-C
\u7b54\u6848D\u597d\u8c61\u5e94\u8be5\u662fe^(-x)\u5427
\u6839\u636e\u5947\u51fd\u6570\u7684\u5b9a\u4e49f(-x)=-f(x),\u53ea\u8981\u5c06-x+\u6839\uff08x^2+1\uff09\u4e58\u4e0ax+\u6839\uff08x^2+1\uff09\u5c31\u53ef\u5c06\u5176\u6362\u539f\u3002\u6b64\u5916\u6709\u516c\u5f0f
ln(1/x)=-lnx\u3002\u8be6\u89c1\u56fe\u7247\u6240\u793a
2.C
3.D
4.C
5.y-2=2(x-1)
6.x>0且x≠正负3
7.4
8.x^2+2x+3
A
C
D
第4题看不懂
2
X大于等于0 你的根号包括后面那些内容啊?
(x+1)^2+2
1.~4.DCDC 5. 2 6.{x|x>=-4且x不=正负3}7.48.x^2 2x 3
1.D
2.C
3.D
4.C
5.y-2=2(x-1)
6.x>0且x≠正负3
7.4
8.x^2+2x+3
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绛旓細涓 D 2.f(x+1)=(x+1)^2+2=x^2+2x+3 3.a.y'=-2sin2x-2sinxcosx=-3sin2x b.y'=e^x+cosx c.2x+2yy'=1 y'=(1-2x)2y =(1-2x)/(2(1-x^2)^(1/2))4 a 鈭(x^3+3x^2-3x-9)dx=x^4/4+x^3-(3/2)x^2-9x+c b (-1/2)[x^-2](2,1)=-(1/2)(...
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绛旓細A锛歵anx/x 锛1 B:(sinx^2)/x 锛漻 C:1/[x(x-1)] 锛濃垶 D:1/(2x-1)锛濓紞1锛鐩存帴浠e叆锛夊鏋滆兘鐩存帴浠e叆锛屽氨鐩存帴浠e叆
绛旓細閫塁 lim(x瓒嬩簬0)(tanx-sinx)/x^3=lim(x瓒嬩簬0)[tanx/x-(1-cosx)/x^2]=lim(x瓒嬩簬0)tanx/x - lim(x瓒嬩簬0)(1-cosx)/x^2 = 1-1/2 (x绛変环浜巘anx 1-cosx=1/2cos^2(x/2)绛変环浜1/2x^2)=1/2 鎵浠anx-sinx绛変环鏃犵┓灏忛噺涓1/2x^3 ...
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绛旓細鍦x鈫0 鐨勮繃绋嬩腑锛涓嬪垪鍙橀噺鏄鏃犵┓灏忛噺鐨勬槸d a锛歝osx浜屾鏂=1 b:e鐨剎娆℃柟=1 c:0.000000001 =0.000000001 d:sinx=0 甯屾湜浣犺兘鐪嬫噦锛屼綘鑳芥槑鐧斤紝 鏈涢噰绾筹紝璧炲悓
绛旓細C x->0鏃锛(sinx)^2/x^2=1