укажите выражение которое не является тождеством x+5y=5y+x ;x^2+25=(x+5)^2 ;3bk-3b=3b(k-1) ;(n+k)(k-n)=k^2-n^2; (2-3x)+5x=2+2x; a^3-8=(a-2)(a^2+2a+4); (x+4)^2=x^2+16; 15x^2+5xy=5x(3x+y)
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