y=4

4y+5y=?19y-y=?4y+5y=9y19y-y=18y

(y^2)^4y-(-2y)^3y^6=(y^2)^4y-(-2y)^3y^6=y^8*y+8y^3y^6=y^9+8y^9=9y^9

数学题=y(y+3)-4(y+3)2=(y+3)(y-4y-12)(y+3)^2/8-y=(y+3)/4-(y-1)/2各项都乘以8,得(y+3)^2-8y=2(y+3)-4(y-1)y^2-2y+9=-2y+10y^2=1y1=-1y2=

方程y''-4y'+13y=0的通解方程y''=(1+y'*y')/2y的通解如图：http://hi.baidu.com/%B7%E3hjf/album/item/ba1dcd725f06c73b8601b089.html2+/-3iC1

(y-4)(3y+2)-(3y-7)(2y+1),其中y=4/3(y-4)(3y+2)-(3y-7)(2y+1)=(4/3-4)(3*4/3+2)-(3*4/3-7)(2*4/3+1)=(-8/3)*6+3*11/3=-16+11=-5吹泡

(-y+5+4y^2)-(-y^2+5y-4),其中y=-2(-y＋5+4y2)-(-y2＋5y-4)=-y＋5＋4y2＋y2-5y＋4=5y2-6y＋9=20＋12＋9=41

2y+5/3y-6-y/2=5y-4/2y-42y+5/3y-6-y/2=5y-4/2y-42y+5/3y-1/2y=3y+211/3y-1/2y=3y+22/3y-1/2y=21/6y=2y=12

求微分方程的通解y''-4y'+3y=0y'-y=3xy'=3x+yy''=3+y'=3x+y+3y''-4y'+3y=03x+y+3-4(3x+y)+3y=03x+y+3-12x-4y+3y=03-9x=0x=1/31.Y=C1*e^x+

求微分方程的通解y''-4y'+3y=0y'-y=3x1:y''-4y'+3y=0则特征方程是r-4r+3=0即：（r-1）（r-3）=0所以r=1或r=3则特征根是1或3则通解为：y=C1e+C2e^3,C1,C2是任意常数2：y'-y=

解分式方程（y+3)/(y^2+y)-1/(1-y)=4/y要过程(y+3)/(y^2+y)-1/(1-y)=4/y(y+3)/(y^2+y)+1/(y-1)=4/y两边乘y(y+1)(y-1)(y-1)(y+3)+y(y+1)=4(y+1

2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-12(y-4)(3y+2)-5(-3y+7)(y+1)=2(-5)(-1)-5(10)0=102(y-4)(3y+2)-5(-3y+7)(y+1)=(2y-8)(3y+2)-(

解分式方程2/y-y/(y-2)=4/(y²-2y)2/y-y/(y-2)=4/(y²-2y)y²-2y+8=0△=b²-4ac=4-32=-28方程无解啊等式两边同时乘y²-2y左边为2(

（y+3/y方+y）-（1/1-y）=4/y(y+3)/(y^2+y)-1/(1-y)=4/y(y+3)/(y^2+y)+1/(y-1)=4/y两边乘y(y+1)(y-1)(y-1)(y+3)+y(y+1)=4(y+1)(y-1)y^2+2

y方+y分之y+3-1-y分之1=y分之4很急,~~错了

微分方程y''-4y'+4y=0的通解其特征方程为r^2-4r+4=0,有两相等的根r=2,故其通解为y=(c1+c2*x)e^x

分解因式:y³-4y²+4y=y³-4y²+4y=y(y^2-4y+4)=y(y-2)^2=y(y²-4y+4)=y(y-2)²

微分方程y''+4y'+4y=8的通解孩纸这是有公式的,自己翻下书!r^2+4r+4=0r1=r2=-2则通解y=(c1+c2X)e^-2x

求解微分方程y''-4y'+4y=0特征方程r^2-4r+4=0r=2(二重根)所以通解是y=(C1+C2x)e^(2x)解微分方程y''-4y'+4y=0特征方程r^2-4r+4=0r1=r2=2通解是y=(C1+C2x)e^(2x)

y''-4y'+4y=e^x微分方程解y''-4y'+4y=e^xy[x]=e^(2x)+e^(2x)x+e^x/4+c

3X+X=()Y+4Y-3Y=()4X2Y