yy+2y+2y+2y+2y=56 y=?y的平方加2y加2y加2y加2y等于56 y等于多少?

yy''-(y')^2=y^2y' yy''-(y')^2=y^2y' yy''-(y')^2=y^2lny 解方程yy-y'^2=y^2y' 解微分方程 yy''-(y')^2=y^2lny 大一高数求微分方程通解,yy''-(y')^2+y'=0 yy''-(y')^2-y'=0求微分通解 求微分方程 yy``+(y`)^2=y` 的通解, 求微分方程通解yy''=(y')^2-(y')^3 3YY-2Y+6=83/2YY-Y+1=?YY=Y的平方 yy+2y+2y+2y+2y=56 y=?y的平方加2y加2y加2y加2y等于56 y等于多少? 微分方程求解.yy''-(y')^2=1 微分方程求解 yy''+(y')2 =ylny yy-(y')^2=y^4,y(0)=1,y'(0)=0求微分方程.答案y=secx 微分方程yy''-2(y')^2yy''-2(y')^2=0 对于(y一撇）y`=y/x(y-1)求导,我求的结果是y``=-y^2-y`x+y/x^2(y-1)^2 怎么不对啊,我的求导过程是：y`x(y-1) - [x(y-1)]` y y`xy-y`x-(y-1+xy`)y -y^2-y`x+yy``=-------------------------=----------------------=-----------------x^2 (y-1 求解微分方程：(1) 2yy‘‘=(y‘)^2+y^2 (2) yy‘‘+(y‘)^2+2x=0 可降阶的高阶微分方程yy''-y'^2-y^2y'=0