1) при m=2,4
3,8*2,4*(2,8*2,4+0,7*2,4) = 9,12*(6,72+1,68) = 9,12*8,4 = 76,608=76,61
2) при m = 8,57
3,8*8,57*(2,8*8,57+0,7*8,57) = 32,566*(23,996+5,999)= 32,566*29,995 = 976,81717= =976,82
Пошаговое объяснение:
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6,8 часа потратил катер на путь по реке от одного причала до другого и обратно.
Пошаговое объяснение:
Собственная скорость катера 17 км/ч, скорость течения реки 3 км/ч
Значит:
17 + 3 = 20 км/ч скорость катера по течению реки
17 - 3 = 14 км/ч скорость катера против течения реки
56/20 + 56/14 = 2,8 + 4 = 6,8 (часа) потратил катер на путь по реке от одного причала до другого и обратно.
Проверим:
Туда и обратно катер проплыл одно и то же расстояние - 56 км.
20 * 2,8 = 14 * 4
56 (км) = 56 (км)- катер проплыл по течению реки и против течения одно и то же расстояние - 56 км.
во второй скобке видим общий множитель м, выносим его за скобку, т.е.получаем: 3,8м^2(2,8+0,7)=3,8*2,4^2*3,5=76,608 или с округлением это будет примерно 79,6
3,8*8,57^2*3,5=976,81717 или с округлением это будет примерно 976,8