(19x-31)(13x-17)-(13x-17)(11x-22)
=(13x-17)(19x-31-11x+22)
=(13x-17)(8x-9)
=(ax+b)(8x+c)
所以
a=13
b=-17
c=-9
所以
a+b+c
=13-17-9
=-13
(19x-31)(13x-17)-(13x-17)(11x-22)
=(13x-17)(19x-31-11x+22)
=(13x-17)(8x-9)
=(ax+b)(8x+c)
所以
a=13
b=-17
c=-9
所以
a+b+c
=13-17-9
=-13