Предмет: Математика, автор: janetka1

Длина Одной из сторон четырехугольника равна 12 см, что составляет 3/4( 3/4 - это дробь) длины второй стороны,которая, в свою очередь, составляет 3/5( это тоже дробь) длины третьей стороны четырехугольника.Чему равен периметр четырехугольника, если длина его четвертой стороны равна сумме длин двух первых сторон.
В ответе должно получиться 82 2/3.( это дробь и целое).

Ответы

Автор ответа: mikael2
2
1 сторона 12
2 сторона 12*4/3=16
3 сторона 16*5/3=80/3=26 2/3
4 сторона 12+16=28

периметр 12+16+26+2/3+28 =82 2/83

janetka1: спасибо)
mikael2: описка 82 2/3 в ответе, как у вас.
janetka1: спасибо огромное ❤️
janetka1: вот только одно интересует, почему если там 3/4(дробь), то 12*4/3=?
mikael2: Мы делим. Вот смотри. Пусть х- длина второй стороны, тогда 3/4 от х = 12. Каково же х? Надо ПОДЕЛИТЬ обе стороны уравнения на 3/4. Но делить 12 на 3/4 все равно что умножить на обратную дробь. х=12*4/3.
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