(5y+1)+ (1-y)= (9y+1)+ (1-3y);
解方程:3y^2-(2y+1)(y-1)=(y-5)(y+1)
解方程3y^2-(2y+1)(y-2)=(y-5)(y-1)
(5y+1)+ (1-y)= (9y+1)+ (1-3y);
for(y=1;y
for (y=1;y
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
解3y+5/3y-6=1/2+5y-4/2y-4
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
解方程y-[3y-1]等于5【y+2]
y'=(x-y+1)/(x+y-3)通解