Đáp án:
Giải thích các bước giải:
(2x+3)2+(2x−3)2−2(2x−3)(2x+3)(2x+3)2+(2x−3)2−2(2x−3)(2x+3)
=(2x+3)2−(2x−3)(2x+3)−(2x−3)(2x+3)+(2x−3)2=(2x+3)2−(2x−3)(2x+3)−(2x−3)(2x+3)+(2x−3)2
=(2x+3)(2x+3−2x+3)−(2x−3)(2x+3−2x+3)=(2x+3)(2x+3−2x+3)−(2x−3)(2x+3−2x+3)
=(2x+3−2x+3)(2x+3−2x+3)=(2x+3−2x+3)(2x+3−2x+3)
=6.6=36