设y=y(x)满足条件
y"+4y'+4y=0
y(0)=2, y'(0)=0
则∫0+∞y(x)dx=( ).
(A) 2 (B) -2 (C) 1 (D) -1
(1)y"-3y'+2y=x;
(2)y2-3y+2=x;
(3)y2-3y'+2=0;
(4)(y')2=2x+5;
(5)dy=(2x+5)dx;
(6)y"=sinx;
(7)dy=(2x+3y-5)dx;
(8)3y"=cos2ysinx;
(9)y"-(y')2+2y=x;
(10)3y"-2y'+4y=0;
(11)xy"+2y"+x(y')4+y=0;
(12)2y"=3y'.
A、2/(x-1)·In(x-1)dx
B、1/(x-1)·In(1-x)dx
C、1/(x-1)·dx
D、2/(x-1)·In(1-x)dx