Question

УМОЛЯЮ РЕШИТЕ ПРИМЕР!!!!!!!7 КЛАСС!!!!!

Answer 1

$(x-5)^2 - 2(x-5)(x+5) + (x+5)^2$ = $x^2-10x+25 - 2(x^2-25) + x^2+10x+25$ = $x^2-10x+25-2x^2+50+x^2+10x+25= 100$