Ответ:
49t²-28t+4=7²t²-2×7t×2+2²=(7t)²-2×7t×2+2²=(7t-2)²
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Ответ:
49t²-28t+4=7²t²-2×7t×2+2²=(7t)²-2×7t×2+2²=(7t-2)²