Ответ:
1) 9y²-30y+25
2) -0,16а²+100с²
3)25+20х+4х²
4) х²-25у²
5) 100
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Ответ:
1) 9y²-30y+25
2) -0,16а²+100с²
3)25+20х+4х²
4) х²-25у²
5) 100