y-7-8y=2y-3-5y 咋写?
y-7-8y=2y-3-5y 咋写?
1.5y+8y-6y=2y-3
解不等式:5y(8-y)-3y(5-3y)+2y(7-2y)>-39
(2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程
{2x+y/3-2y=0 2(2x+y)-5=7y
10y+2(7y-2)=5(4y+3)+3y怎么算
解方程:(y+4)/5+y+6=(y+8)/2-(y+4)/3
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
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)
解方程:3y^2-(2y+1)(y-1)=(y-5)(y+1)