8y+12=8-8y-5y+10
8y-4=12-5y+9y
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
1.5y+8y-6y=2y-3
10(8-y)+6y=56
8y-3=5y+3
5y十8y=多少
先化简,在求值:6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y=
y-7-8y=2y-3-5y 咋写?
解方程:(y+4)/5+y+6=(y+8)/2-(y+4)/3
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(