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светлана502
@светлана502
July 2022
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(3a+7)^2 как решить это
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Teen1313
Это квадрат суммы двух выражений
(3а)^2+7^2+2×3а×7
9а^2+49+42а
1 votes
Thanks 2
krasnosolnyshkp2ymc9
(3a+7)²=9a²+2*3a*7+49= 9a²+42a+49
квадрат суммы
1 votes
Thanks 2
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Answers & Comments
(3а)^2+7^2+2×3а×7
9а^2+49+42а
квадрат суммы