Предмет: Математика, автор: Аноним

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Ответы

Автор ответа: iramazurk
0

Ответ:

Пошаговое объяснение:

113

а)

300 кг семян = 144 масла

225 кг семян = х кг масла

300/225 = 144/х

х = 144 * 225 / 300

х = 32400/300

х = 108

Ответ: 108 кг масла из 225 кг семян

б)

300 кг семян = 144 кг масла

х кг семян = 420 кг масла

300/х = 144/420

х = 300 * 420 / 144

х = 126000/144

х = 875

Ответ: 875 кг семян, для 420 кг масла

114

15% = 15 : 100 = 0,15

520 * 0,15 = 78 (га) - собрали урожай

Ответ: с 78 га

115

а)

Найдём масштаб карты:

120 км = 12000000 см

4,8 : 12000000 = 4,8/12000000 = 1/2500000

Масштаб карты =

1 : 2 500 000

б)

160 км = 16000000 см

х = расстояние на карте

х/16000000 = 1/2500000

х = 160000000 * 1 / 25000000

х = 16000000/2500000

х = 6,4

Ответ: 6,4 см расстояние на карте между городами C и D

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