Unity : How to rotate,scale, translate with matrix?

MatrixRotateScaleTranslate.cs

 public static Matrix4x4 RotateX(float aAngleRad)
 {
     Matrix4x4 m = Matrix4x4.identity;     //  1   0   0   0 
     m.m11 = m.m22 = Mathf.Cos(aAngleRad); //  0  cos -sin 0
     m.m21 = Mathf.Sin(aAngleRad);         //  0  sin  cos 0
     m.m12 = -m.m21;                       //  0   0   0   1
     return m;
 }
 public static Matrix4x4 RotateY(float aAngleRad)
 {
     Matrix4x4 m = Matrix4x4.identity;     // cos  0  sin  0
     m.m00 = m.m22 = Mathf.Cos(aAngleRad); //  0   1   0   0
     m.m02 = Mathf.Sin(aAngleRad);         //-sin  0  cos  0
     m.m20 = -m.m02;                       //  0   0   0   1
     return m;
 }
 public static Matrix4x4 RotateZ(float aAngleRad)
 {
     Matrix4x4 m = Matrix4x4.identity;     // cos -sin 0   0
     m.m00 = m.m11 = Mathf.Cos(aAngleRad); // sin  cos 0   0
     m.m10 = Mathf.Sin(aAngleRad);         //  0   0   1   0
     m.m01 = -m.m10;                       //  0   0   0   1
     return m;
 }
 public static Matrix4x4 Rotate(Vector3 aEulerAngles)
 {
     var rad = aEulerAngles * Mathf.Deg2Rad;
     return RotateY(rad.y) * RotateX(rad.x) * RotateZ(rad.z);
 }
 public static Matrix4x4 Scale(Vector3 aScale)
 {
     var m = Matrix4x4.identity; //  sx   0   0   0
     m.m00 = aScale.x;           //   0  sy   0   0
     m.m11 = aScale.y;           //   0   0  sz   0
     m.m22 = aScale.z;           //   0   0   0   1
     return m;
 }
 public static Matrix4x4 Translate(Vector3 aPosition)
 {
     var m = Matrix4x4.identity; // 1   0   0   x
     m.m03 = aPosition.x;        // 0   1   0   y
     m.m13 = aPosition.y;        // 0   0   1   z
     m.m23 = aPosition.z;        // 0   0   0   1
     return m;
 }
 public static Matrix4x4 TRS(Vector3 aPos, Vector3 aEuler, Vector3 aScale)
 {
     return Translate(aPos) * Rotate(aEuler) * Scale(aScale);
 }


    var pos = new Vector3(2, 5, -7);
     var euler = new Vector3(20, 45, 10);
     var scale = new Vector3(20, 15, 5);
     var m1 = Matrix4x4.TRS(pos, Quaternion.Euler(euler), scale);
     var m2 = TRS(pos, euler, scale);