(3y-1)(-9y^2-1)(-1-3y)=
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(3y-1)(-9y^2-1)(-1-3y)=(3y-1)(-9y^2-1)(-1-3y)=(3y-1)(-9y^2-1)(-1-3y)=(3y-1)(-9y^2-1)(-1-3y)=(-1+3y)(
(3y-1)(-9y^2-1)(-1-3y)=
(3y-1)(-9y^2-1)(-1-3y)=
(3y-1)(-9y^2-1)(-1-3y)=
(3y-1)(-9y^2-1)(-1-3y)
=(-1+3y)(-1-3y)(-9y^2-1)
=[(-1)^2-(3y)^2](-9y^2-1)
=(1-9y^2)(-9y^2-1)
=(-9y^2+1)(-9y^2-1)
=(-9y^2)^2-1^2
=81x^4-1
y=kx
x=m/z
则y=km/z
km是常数
所以y是z的反比例函数
（x-2）（x+3）
=x平方+x-6
=ax的平方+bx+c
所以a=1,c=-6
所以a-c=7
y (3y^2+8y-3)-6y(3y+2y-1)+9y
通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9
(1-3y)(1+3y)(1+9y^2)
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)
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)
9y^3-9y^2+2y+1=0 求3y-1=?
4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3)
[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),'.')
解方程：3y^2-(2y+1)(y-1)=(y-5)(y+1)
2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-1
(y-4)(3y+2)-(3y-7)(2y+1),其中y=4/3
解方程3y^2-(2y+1)(y-2)=(y-5)(y-1)
5y∧2-(y-2)(3y+1)-2(y+1)(y-5)
解方程：3y²-(2y+1)(y-2)=(y-5)(y+1)
解分式方程（y+3)/(y^2+y)-1/(1-y)=4/y要过程