Ответ:
3
(9t-7)(9t-7)=81t^2-63t-63t+49
81t²-126t+49=(9t-7)(9t-7)=(9t-7)²
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Ответ:
3
(9t-7)(9t-7)=81t^2-63t-63t+49
81t²-126t+49=(9t-7)(9t-7)=(9t-7)²