1) 9y²-12xy+4х²=(3y-2x)² или 9х²-12ху+4у²=(3х-2у)² (ошибка в условии)
2) 25t²+30t+9=(5t+3)²
3) 16k²-40k+25=(4k-5)²
4) 121a²-44ac+4c²=(11a-2c)²
5) 4n²+52mn+169m²=(2n+13m)²
6) 36t²-84ts+49s²=(6t-7s)²
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1) 9y²-12xy+4х²=(3y-2x)² или 9х²-12ху+4у²=(3х-2у)² (ошибка в условии)
2) 25t²+30t+9=(5t+3)²
3) 16k²-40k+25=(4k-5)²
4) 121a²-44ac+4c²=(11a-2c)²
5) 4n²+52mn+169m²=(2n+13m)²
6) 36t²-84ts+49s²=(6t-7s)²