1-2(y-3)=15(1/5y-1)求解方程,要一次一元方程

4（5—2y)+7(y+1)=3(4y-1)+17求y 4*（5—2y)+7(y+1)=3(4y-1)+17求y (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 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 求下列微分方程的通解或特解：(1) 3y''-2y'-8y=0 (2) 4y-8y'+5y=0(3) y+4y'+29y=0,y|(下角x=0)=0,y'|(下角x=0)=15(4) 2y+5y'=5x^2-2x-1 9y^3-9y^2+2y+1=0 求3y-1=? 已知y^2+3y-1=0.求y^2+1/y^2的值 102=8/(1+y)+8/(1+y)^2+8/(1+y)^3+8/(1+y)^4+108/(1+y)^5 求y=? 4Y^3+3Y^2+4Y+1=0求Y 已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 导数题.y'=2y(y+5) f(t)=y 当t＝2 y＝3 求 当t＝1 y＝?更正：y'=－2y(y+5) 已知y=-2,求2y-2/y^2-2y+1+y+1/y-1-y的值 求y''=1+y'^2通解... 4x-3y=5 x^2+y^2=1 求x,y 3x+4y-5=0 x^2+y^2=1求x.y