Предмет: Математика, автор: vika27042000

Длину прямоугольника уменьшили на 20%,а ширину на 10%.На сколько процентов уменьшилась площадь прямоугольника?

Ответы

Автор ответа: Perkinap
0
S1=A* В - первоначальная площадь (А- длина В-ширина)
S2=0,8А*0,9В =0,72*А*В  - площадь после уменьшения сторон
1-0,72=0,28- на 28% изменилась площадь
Автор ответа: vika27042000
0
спасибо
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