The learning method is reported in the second issue of the eighth grade edition of Lujiao's Mathematics Weekly.
d A A B X/60 ABC-3/ 10AX- 1 12x 3-Y/Y+2A+2B/3b 1/N- 1/N+ 1 2009/2065438。 The square of x- 1 3m+2/2m (m+1) and the square of a/5 (a-4) (a-5) (m/a)+(m+1/a).