作者pp20624 (kk)
看板trans_math
标题[积分] 几题积分
时间Mon Jun 6 23:54:11 2011
1)
４
Ｓ ------- dx
x^2+9
2)
4x
S ----- dx
x^2+9
3)
4x^2
S ------dx
x^2+9
4)
x
find S lim + (sin x)
x-->0
=>lim + ln sin x
x--->0 -------- 後面就不懂了
e 1
-----
x
5)
sin x
S S ------ dA
R x
where R is the triangle in xy plane bounded by
the x axis , the line y=x , and line x = 1
6)
find the minimum value of the function
f(x,y,z) = 2x^2 + y^2 + 3z^2
subject to 2x-3y-4z =49
算出来x=3, y=-9 , z=-4
请问後面是直接带回去f吗？？
请大大帮忙指点 一题也可以
我知道我很弱 orz
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◆ From: 61.227.122.183
※ 编辑: pp20624 来自: 61.227.122.183 (06/06 23:55)
1F：→ RLCorn:第四题是用罗必达法则 140.115.209.33 06/07 10:41
2F：→ RLCorn:转成标准不定型 140.115.209.33 06/07 10:41
3F：→ pp20624:456有请大大帮忙 61.227.114.94 06/09 16:57