Предмет: Математика, автор: Sokol04

Периметр треугольника равен 7дм 9см. Первая его сторона равна34см,вторая-2дм. Найти длину третьей стороны

Ответы

Автор ответа: koreec3

0

переводим... периметр равен 79см
P=a+b+c
79=34+20+с
79=54+с
с=79-54
с=25

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