Какое равенство верно, а какое неверно?

1) 125+a3=(5+a)(25+10a+a2)125+a3=(5+a)(25+10a+a2)
2) y3−1=(y−1)(y2−y+1)y3−1=(y−1)(y2−y+1)
3) 25a2−4=(5a−2)(2+5a)
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