t²x´´＋tx´-x=0求它的解求它的通解……大学常微分方程

t²x´´＋tx´-x=0求它的解求它的通解……大学常微分方程 这首歌的歌词的中文意思谁帮把这首歌的歌词翻译过来I´m a little used to calling outside your name I wont see you tonight so I can keep from going insane But I don´t know enough I get some kinda lazy day Hey now I&acut 设f(x)=tan(x²+1)sec2x,则f´(x)= 英语翻译Back it up,back it upYou got it,you got itPut your hands up,put your hands up,put your hands upYou got it,you got itDrive back baby to me,fast in your carI´m here waiting,crash into me real hard[2x]I wander round the room and I&acut acute I wouldn´t believe you 中文 My english isn´t very good, i don´t know anything, 设f(x)=x²,则=f´[f(x)]=?请问,打问号处我该填什么?这是我们作业中的一道问题 已知不等式X²-3X+T 已知不等式x²-3x+t No...i don´t afraid of nothing- I´m ignorant, x²-1分之x²+x,化简x²-6x+9分之x²-9化简...T 因式分解请帮下忙!因式分解：1.（x+y）²-4（x+y）-12 2.x²+（k+2）x+(k+1） 3.（x²+3x）²-8（x²+3x）-204.（t² +4t）² -2（t² +4t）-24 5.4a² b² -（a² +b² ）² Don´t explain the reason to me. 求音乐：i don´t know why what is the differen´t between in and into 求解下列微分方程组,不用matlab解微分方程组,求解下列微分方程组 x´=x+2y-e^(-t)y´=4x+3y+ 4e^(-t)满足x(0)=y(0)=1的解