3(3+y)-8y=14 y=-1
1.5y+8y-6y=2y-3
解方程:3y^2-(2y+1)(y-1)=(y-5)(y+1)
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
解方程3y^2-(2y+1)(y-2)=(y-5)(y-1)
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
解方程:4(2y+3)=8(1-y)-5(y-2) 解8y+3=8-y-5y+2 14y=7 所以y=1/2 错在:原因
已知y^2+3y-1=0求y^4/y^8+3y^4+1的值
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
y'=(x-y+1)/(x+y-3)通解
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
8y-3=5y+3
y(1)=4.y^{3}