-x-|||-C.2x-|||-D. -2x

(B.) y = (1)/(2)x^2e^2x + sin 2x. (C.) y = (x)/(2)(x + 4)e^3x. (D.) y = (x^2co

(B)F(2x). (C)F(x^2). (D)F(|x|).

(B) =(ax+b)(e)^2x 。-|||-(C) =x(ax+b)(e)^2x . (D) =(x)^2(ax+b)(e)^2x .

(D) (e)^2x+x(e)^2x(Bcos 2x+Csin 2x).

【题目】若 f(x) 为连续函数,则∫f(2x)dx=()(A)f(2x)+C(B)f(x)+C(c) 1/2f(2x)+C(D)2f(2x)+C【题目】若 f

(2)微分方程 (y)^n+y-y=0 的通解是 () .-|||-(A) =(C)_(1)(e)^x-(C)_(2)(e)^-2x (B) =(C)_(1)(

设=ln (x)^2+ln 2x，则=ln (x)^2+ln 2x（ ）=ln (x)^2+ln 2x=ln (x)^2+ln 2x=ln (x)

^x((x)^2+2x) D. ^x((x)^2-2x)

计算极限lim _(xarrow 0)dfrac ({x)^2sin 2x}(x-{int )_(0)^x}(e)^(t^2)dt.计算极限.

=(e)^2x 是该微分方程的一个解-|||-D.该微分方程的通解为 =(e)^2x((C)_(1)cos 4x+(C)_(2)sin 4x)