Периметр треугольника равен 27 см. чему равна длины сторон треугольника , если вторая его сторона на 2 см длиннее первой , а третья сторона на 4 см короче второй . ( заранее )

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Ответ:

Dog2111

19.05.2020

Х первая сторона
Х+2 вторая
Х+2-4 третья
P=27
Х+х+2+х+2-4=27
3х=27
Х=27:3
Х=9 см первая
9+2=11 см вторая
11-4=7 третья сторона треугольника

4,4(43 оценок)

Ответ:

larry19

19.05.2020

1 сторона-х 2 сторона х+2, 3 сторона х-2
x + (x+2) + (x-2) = 27
3x=27
x=9
9см - первая сторона
11см -вторя сторона
7см 3 сторона

4,8(5 оценок)

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Ответ:

Миша142546

19.05.2020

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4,6(76 оценок)

Ответ:

VarvaraErrorFell

19.05.2020

Пошаговое объяснение:

Пусть неизвестный катет равен x см. По теореме Пифагора или из соотношений сторон в прямоугольном треугольнике находим, что гипотенуза отрезанного треугольника равна x корень из 2 . Поскольку все стороны восьмиугольника должны быть равны, получаем уравнение 40 минус 2x=x корень из 2 , откуда x умножить на (2 плюс корень из 2 )=40, откуда

x= дробь: числитель: 40, знаменатель: 2 плюс корень из 2 конец дроби =20(2 минус корень из 2 ).

Подставляя значение 1,41 вместо корень из 2 , получаем:

x\approx20 умножить на 0,59=11,8.

Итак, длина катета равна приблизительно 11,8 см, то есть 118 мм.

ответ: 118.