(3+y)^2可以化简成(3+y)^3/3

1.5y+8y-6y=2y-3 (y^2-3y+2)(y^2+3y-2)=y^2(y+3)(y-3) [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 解方程3y^2-(2y+1)(y-2)=(y-5)(y-1) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 【x-3y][x+y]-[x-2y][x +2y]-[x-y 解方程：3y^2-(2y+1)(y-1)=(y-5)(y+1) 3x+3y/x²-y² 为什么可以化简为 3/x-y y''+y'+2y=x^2-3通解. (x+y)(x-y)-(2xy+3y)平方 计算(x+y)(x+y)^2(-x-y)^3 求微分方程y”-3y’+2y=5