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aellazhumashovа
aellazhumashovа
26.11.2022 10:25 •  Алгебра

Знайти суму девятнадцяти перших натуральних чисел

👇
Ответ:
DedSToporom
DedSToporom
26.11.2022

думаю прогрессией решение правильное должно быть

S19=1+19/2*19= 190

4,6(43 оценок)
Ответ:
даsha3
даsha3
26.11.2022

ответ:171

Объяснение:Потому что 0 тоже натуральное число.

4,4(54 оценок)
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Ответ:
he11sp0re
he11sp0re
26.11.2022
Х - количество станков 1-го типа
у - количество станков 2-го типа
По условию
х - у > 5
Имеем  систему двух неравенств 
{13x + 12y ≤ 305
{15x +24y > 438
Решаем методом сложения
Первое неравенство умножим на 2, а второе умножим на (-1),
{13х*2 + 12у*2 ≤ 305*2
{15х*(-1) + 24у*(-1) < 438*(-1)
Сложим эти неравенства
26х + 24у - 15х - 24у ≤ 610 - 438
11х ≤ 172
х ≤ 172 : 11
х ≤ 15,6  
Ближайшее целое х= 15 - количество станков 1-го типа
По условию х > y более, чем на 5, т.е минимум на 6 и более, поэтому проверим у=15-6=9
у=9 - количество станков 2-го типа
Проверка значений х=15; у= 9
{13 * 15 + 12 * 9 ≤ 305
{15*15 + 24*9 > 438 
Считаем
{195 + 108 ≤ 305    =>  303 ≤  305  - верное неравенство
{225 + 216 > 438   =>   441 > 438   - верное неравенство 

ответ; 15 станков 1-го типа;
               9 станков 2-го типа
4,6(98 оценок)
Ответ:
гсооагвгв
гсооагвгв
26.11.2022

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