y-2y+1/2=9-8-y/4
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y-2y+1/2=9-8-y/4
y-2y+1/2=9-8-y/4
y-2y+1/2=9-8-y/4
y-2y+1/2=9-8-y/4 ;
把y都移到一边,数字移到另一边,移项要变号;
y-2y+y/4=9-8-1/2;
-3/4y=1/2;
y=-2/3;
y- 2y+1/2=9- 8-y/4
y-2y+1/2=9-8-y/4
y (3y^2+8y-3)-6y(3y+2y-1)+9y
[T,Y]=ode45(@rigid,[0 1],[rand(15,1)]);plot(T,Y(:,1),'-',T,Y(:,2),'-.',T,Y(:,3),'.',T,Y(:,4),'-',T,Y(:,5),'-.',T,Y(:,6),'.',T,Y(:,7),'-',T,Y(:,8),'-.',T,Y(:,9),'.',T,Y(:,10),'-',T,Y(:,11),'-.',T,Y(:,12),'-.',T,Y(:,13),'.',T,Y(:,14),'-',T,Y(:,15),'.')
y-2[y-4(y-1)]-8=0
常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x)
(y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值.
方程y''-4y'+13y=0的通解方程y''=(1+y'*y')/2y的通解
x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-xy=?x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1 y=?x=?x+y-xy=?
急,看不懂问我(y+3)^2/8-y=(y+3)/4-(y-1)/2
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Y的平方+3Y-1=0 y+3-1/y=0 y-1/y=-3 (y-1/y)^2=9 y^2+1/y^2-2=9 y^2+1/y^2=11 (y^2+1/y^2)=121 y^4+1/y^4+y^2+1/y^2-2=9y^2+1/y^2=11那个-2是怎么来的?
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