作函数图像：

y=x/x^x(x+1)

作函数图像：

y=100cos(xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xx+6x+9);

作函数图像：

y=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;xcosxx;xsinx

作函数图像：

y=sin(4x)+5;

作函数图像：

y=0.4^(X);0.2^（x）