линийный= \colorblue a + \colorred b                                                                                                               
 квадратый= \colorblue a  · \colorblue a + \colorblue a  · \colorred b + \colorred b  · \colorred b                                                  
кубический= \colorblue a  · \colorblue a  · \colorblue a + \colorblue a  · \colorblue a  · \colorred b + \colorblue a  · \colorred b  · \colorred b +
                                                                                               
                                                                                               
                                                      \colorred b  · \colorred b  · \colorred b