定积分求面积太困了,做不下去...
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/19 13:19:17
xJ@_%T*
%M
oeQ$&M*nt!(nD슾4oLՊ.937猗6Rna=?N0/EK֖4ʲ̯$++ZJS FqΌ%b5'v\5x@diݏ5!"D@;8-
vf$Pd!Ӣ.deEԆZ scTZ Gbʋsv`"J9Su(e!#z*FAF
n)J*A>SA`
w+gMk"mBk"1bb8dNʻۼJA$"p^ և4HV~z\وʨ*rA/IAuJa} y `d)[oo
定积分求面积太困了,做不下去...
定积分求面积
太困了,做不下去...
定积分求面积太困了,做不下去...
y = e^x = e^18
x = 18,A(18,e^18)
y = e^(2x) = e^18,x = 9
S = S1 + S2
= ∫₀⁹[e^(2x) - e^x]dx + ∫₉¹⁸[e^18 - e^x]dx
= [(1/2)e^(2x) - e^x]|₀⁹ + [(e^18)x - e^x]|₉¹⁸
= (1/2)e^18 - e^9 - (1/2 - 1) + (18e^18 - e^18) - (9e^18 - e^9)
= (17e^18 + 1)/2