Предмет: Математика, автор: madiyar051995

помогите пожалуйста решить

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Автор ответа: lisickaaviktoria885

0

Ответ:пусть первое число x
тогда второе 0.3x
а третье 0,7*0,3x
0.7*0.3=0.21
=> 21 процент от первого числа составляет третье

Пошаговое объяснение:

Автор ответа: pmilana769

0

Ответ:

54:3×1=18(ч) число первого.

54:3×5=90

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Computer is one of the inventions of the 20th century that changed the
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