Вопрос школьника по предмету Математика
Помогите,пожалуйста решить уравнение.
(13,4-у)×4,3-20,05=78,05+6,7у
Прошу, помогите.
Ответ учителя по предмету Математика
57,62 — 4,3y-20,05=78,05+6,7y
-4,3y — 6,7 y= 78,05- 57,62+20,05
-11y=40,48
y=-3,68
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Scientists discovered three centuries ago that living things contain cells, but only in the last three decades have they begun to piece together the puzzle of how cells operate . They know a few fundamental things: every single adult cell (except ova and sperm) contains the same set genes as the original cell. Still cells come in all shapes, sizes and functions: slim nerve cells more than 3 feet long and about 1 forty-thousandth of an inch wide: transmit impulses between the limbs and the brain: red blood cells 3 ten-thousandth of an inch in a diameter cany life — giving oxygen around the body. But researchers remain baffled by arcane chemical mechanism that enables particular genes in different cells to switch themselves on and off perform differently in varying circumstances .
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Toxic garbane. Cells occasionally go wrong. Recycling systems can break down, overloading the cells with their own toxic garbage the result is the fatal Tay-Sachs disease, or some similarly horrendous genetic ailment. Confused by erroneous information, internal factories can add many chemicals to an already abundant supple that they eventually flood the whole body: the resulting accumulations of cholesterol lead directly to cardiovascular disease. A breardown in communications between the nuclei of cells and their outer borders can produce the unrestricted growth that causes cancer. Even if they operate smoothly, normal cells eventual succumb to old age -the process of biological decay that alters the cells and kills organism of which they for the basic units.
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ж) 2х+4у-90=0,
х-3у-10=0;