Предмет: Математика, автор: danakarpenko966

7.(2 бали) Розв'язати рiвняння: 1) 8x+5=3x-10; 2) -5(7-x) = 6(x +2)​

Ответы

Автор ответа: Kormash
0
1) 8x+5=3x-10
8х-3х=-10-5
5х=-15
х=-3
2) -5(7-x) = 6(x +2)
-35+5х=6х+12
5х-6х=12+35
-х=47
х=-47
Автор ответа: Ilonkaa3
0

Пошаговое объяснение:

1)8x+5=3x-10

8x-3x=-10-5

5x=-15

x=–3

2)-5(7-x)=6(x+2)

-35+5x=6x+12

5x-6x=12+35

-x=47

x=-47

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A) Now to the story of Alexander Graham Bell and how he invented the telephone. On June 2, 1875, he was experimenting in Boston with the idea of sending several telegraph messages over the same wire at the same time. He was using a set of steel reeds. He was working with the receiving set in one room, while his assistant, Thomas Watson, operated the sending set in the other room.
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C) When you speak, the air makes your vocal cords vibrate. These vibrations are passed on to the air molecules so that sound waves come out of your mouth, that is, vibrations in the air. These sounds waves strike an aluminium disk or diaphragm in the transmitter of your telephone. And the disk vibrates back and forth in just the same way the molecules of the air are vibrating.
D) Watson plucked a steel reed to make it vibrate, and it produced a twanging sound. Suddenly Bell came rushing into the room, crying to Watson: “Don’t change anything. What did you do then? Let me see.” He found that the steel rod, while vibrating over the magnet, had caused a current of varying strength to flow through the wire. This made the reed in Bell’s room vibrate and produce a twanging sound.
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