Предмет: Математика, автор: aylamemmedzade1

периметр прямоугольника 12,8см. Найдите площадь прямоугольника, если ширина на 2,4 см меньше длины

aylamemmedzade1: За пешеход прошел путь между двумя селами за 7 часов а путь между селом и городом за 3 часа найдите длину всего пути пройденного пешеходом если расстояние между селами на пять целых шесть километров больше чем между городом и селом

Ответы

Автор ответа: kochechka007

1

ширина-х
длина-х+2,4
х+х+х+2,4+х+2,4=12,8
4х+4,8=12,8
4х=12,8-4,8
4х=8 х=2
2-ширина
2+2,4=4,4- длина
S=2×4,4=8,8

Pro100semaa: Или:

kochechka007: что или?

kochechka007: кстати 8,8 см в квадрате

shavrova78: (х-2,4)*2+2х=12,8
2х-4,8+2х=12,8
4х=12,8+4,8
4х=17,6
х=4,9 длинна
у=4,9-2,4=2,5 ширина
S=4,9*2,5=12,25см2

kochechka007: эм, незнаю, хотя я не поняла твоего решения, точнее вникать не хочу, т к делаю уроки( возможно я накосячила, не знаю

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