а)8/21:м=2/3
м = 8/21 : 2/3 значит, получаем: 8 х 3 сокращаем и получаем 4/7
21 х 2
б)1цел.5/7х-5/9=2цел.4/9 , обращаем числа в неправильные дроби и переносим вправо с противоположным знаком, получаем: 12/5 х = 22/9 + 5/9, решаем:
12/5 х = 27/9, то есть 12/5 х = 3, продолжаем:
х = 3 : 12/5, это значит,переворачиваем дробь и получаем:
х = 3 умножить на 5/12, а это равно:
х = 15/12 или 5/4, переводим в десятичную дробь:
х = 1,25
в)5/14z-1/3z+1/7z=1/4, приводим к общему знаменателю 42
15/42z-14/42z+6/42z=1/4,производим вычисления:
7/42z=1/4,сокращаем: 1/6z=1/4, значит, z=1/4:1/6,переворачиваем дробь и умножаем:
z=1/4 умножить на 6/1
z= 6/4, переводим в десятичную дробь:
z = 1,5
ПРО СВЕТЧЩИЕСЯ НАДУВНЫЕ КРУГИ!
It would seem, beach rubber rings - an attribute not for winter time. However, the French city of Lyon has recently appeared unusual light installation Floating Lights, was created out of this extraordinary material for December.
Lyon - this is one of the centers of contemporary art in Europe. In the French city regularly hosts international festivals devoted to various forms of manifestation Nouveau creative thought.
As examples of the most impressive works by artists featured in Lyon, you can cast dancing figures Key Frames, pinball light on the front of the theater or the installation of Floating Lights, there appeared a few days ago.
Every winter in Lyon is an international festival of light art. That's part of his artist Travesias de Luz this year and presented the installation Floating Lights.
Installation Floating Lights is composed of many different colors glowing inflatable rings that people commonly use in the summer on the beach to swim in the river or the sea without making much effort. However Travesias de Luz hang these items on the wall, and even supplied them with LED backlight, able to change color under computer control.
Moreover, the artist every day something to fix this installation - changes the backlight adds or removes some rubber rings to create a way with light different shapes or characters.
Sam Travesias de Luz explains installation Floating Lights idea that people usually do not see a clear outline of light rays for him always remain shapeless and intangible. In his own work, the artist offers viewers a closer look at the light, and even touching it.
2. 8÷2=4 (т.)переработали моркови на сок
3.12÷4=3 (т.) переработали свеклы на сок
4. 8+12=20 (т.) всего овощей
5. 8-4=4 (т.) увезли в магазин моркови
6. 12-3=9 (т.) увезли в магазин свеклы
7. 4+9=13 (т.) всего овощей отвезли в магазин