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Азот11
Азот11
21.10.2022 11:49 •  Алгебра

1. в городе n живет 200 000 жителей. среди них 15% детей и подростков. среди взрослых жителей 45% не работает (пенсионеры, студенты, домохозяйки и т. сколько взрослых жителей работает?

👇
Ответ:
slaviktaran00
slaviktaran00
21.10.2022
200000100℅. 200000100℅
х15%. х45℅
х=200000×15 \100. х=200000×45 \100
х=30000. х=90000
30тыс+90тыс=120тыс 20000-120000=80000

200000100℅
80000х℅
х=80000×100 \200000
х=40℅. ответ: взрослые жителей которые работают 40℅=80тыс
4,4(61 оценок)
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Ответ:
гсооагвгв
гсооагвгв
21.10.2022

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Must Waste More Time...

4,8(58 оценок)
Ответ:
Zein304
Zein304
21.10.2022

12 км/час

Объяснение:

Моторная лодка за 8 часов проплыла 45 км против течения и вернулась обратно. Найди скорость моторной лодки в стоячей воде, если скорость течения реки равна 3 км/час.

Скорость моторной лодки в стоячей воде v км/час

Скорость моторной лодки против течения (v-3) км/час

Скорость моторной лодки по течению (v+3) км/час

Время затраченное на путь против течения 45/(x-3) час

Время затраченное на путь по течению 45/(x+3) час

45/(x-3)+45/(x+3)=8

(x-3)(x+3)(45/(x-3)+45/(x+3))=8(x-3)(x+3)

45(x+3)+45(x-3)=8(x²-9)

45x+135+45x-135=8x²-72

8x²-90x-72=0

4x²-45x-36=0

D=2025+576=2601=51²

x₁=(45-51)/8=-3/4<0

x₂=(45+51)/8=12 км/час

4,5(21 оценок)
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