Question

高数简单题求解

求解

Answer 1

看我给你的解答。

用一下换元法。

Answer 2

X = AX+B, (E-A)X = B, X = (E-A)^(-1) B
(E-A, B) =
[ 1 -1 -1 2 -1]
[-1 1 -1 0 2]
[-1 -1 1 2 2]
初等行变换为
[ 1 -1 -1 2 -1]
[ 0 0 -2 2 1]
[ 0 -2 0 4 1]
初等行变换为
[ 1 -1 -1 2 -1]
[ 0 1 0 -2 -1/2]
[ 0 0 1 -1 -1/2]
初等行变换为
[ 1 -1 0 1 -3/2]
[ 0 1 0 -2 -1/2]
[ 0 0 1 -1 -1/2]
初等行变换为
[ 1 0 0 -1 -2]
[ 0 1 0 -2 -1/2]
[ 0 0 1 -1 -1/2]
X =
[-1 -2]
[-2 -1/2]
[ -1 -1/2]

Answer 3

[最佳答案]有一个重要极限不知道你记不记得!——lim(sinx)/x=1 本题:limsin(bx)/x...

Answer 4

这个题其实并不难啊，你弟从方程入手，慢慢的解决，别着急哦好好