1.2y-0.04y=9y^2
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1.2y-0.04y=9y^2
1.2y-0.04y=9y^2
1.2y-0.04y=9y^2
写错了吧
9y²-1.2y+0.04=0
(3y-0.2)²=0
3y-0.2=0
y=1/15
1.2y-0.04y=9y^2
1.2y-0.04=9y^2
(y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值.
y (3y^2+8y-3)-6y(3y+2y-1)+9y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
y- 2y+1/2=9- 8-y/4
y-2y+1/2=9-8-y/4
yy''-(y')^2=y^2y'
yy''-(y')^2=y^2y'
y+y'-2y=2x
微分方程y - 2y' + y = x
2y''+y'-y=0
|2y-6|=9+4y
先化简,再求值:(y-2)(2y²-3y+9)-y(y²-2y+15),其中Y²-4Y-4=0.
y'(2y-y')=y^2*(sinx)^2求解,
(y^2)^4y-(-2y)^3y^6=
方程y''=(1+y'*y')/2y的通解
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)