Пусть масса свежей брусники m, после сушки остается 25% от исходного веса, т.е. 0,25*m, и это есть 6 кг по условию.
0,25*m = 6 кг,
m = (6/0,25) кг = 24 кг.
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Если а=2 или а=3, то уравнение имеет одно решение х=12 в остальных случаях два, исключаем только промежуток (2;3) -здесь решений нет.
Так при а= 2 или а=3, правая часть равна нулю и решаем простое уравнение 12-х=0; х=12.
6*6 в 5 степени и разделить на 6 в 7 степени = просто 6
16×3=48
13×4=52
48+52=100
Ответ: по алгебре 16 заданий
по геометрии -13