Выбери равенства, которые являются тождествами:

xy=yx
(x+y)+z=x+(y+z)
x2+xy+y2=(x+y)2
x2−y2=x2−2xy+y2
(xy)z=x(yz)
x+y=y+x
x(x+3)(x+3)=x,x≠−3
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