11. Решите уравнение: 1) 3(x - 2) = x + 2; 2) 5 - 2x - 1)=4 - x; 3) (7x + 1) - (9x + 3) = 5; 4) 3,4 + 2y = 7(y -2,3); 5) 0,2(7.-2y)= 2,3 - 0,3(y - 6);. Created by Satpad. algebra-ru

11. Решите уравнение: 1) 3(x - 2) = x + 2; 2) 5 - 2x - 1)=4 - x; 3) (7x + 1)

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Ответ:

$1)\ \ 3(x-2)=x+2\ \ ,\ \ \ 3x-6=x+2\ \ ,\ \ 3x-x=2+6\ \ ,\ \ 2x=8\ \ ,\ \ x=4\\\\\\2)\ \ 5-(2x-1)=4-x\ \ ,\ \ 5-2x+1=4-x\ \ ,\ \ 2x-x=6-4\ \ ,\ \ x=2\\\\\\3)\ \ (7x+1)-(9x+3)=5\ \ ,\ \ 7x+1-9x-3=5\ \ ,\ \ -2x-2=5\ \ ,\\\\{}\ \ \ -2x=7\ \ ,\ \ x=-3,5\\\\\\4)\ \ 3,4+2y=7(y-2,3)\ \ ,\ \ \ 3,4+2y=7y-16,1\ \ ,\ \ 5y=19,5\ \ ,\ y=3,9\\\\\\5)\ \ 0,2(7-2y)=2,3-0,3(y-6)\ \ \ ,\ \ \ 1,4-0,4y=2,3-0,3y+1,8\ \ ,\\\\0,4y-0,3y=1,4-2,3-1,8\ \ \ ,\ \ \ 0,1y=-2,7\ \ ,\ \ y=-27$

5 votes Thanks 5

ludmilaksenija2005

Объяснение:

3(х-2)=х+2

3х-6=х+2

3х-х=2+6

2х=8

Х=4

5-(2х-1)=4-х

5-2х+1=4-х

-2х+х=4-5-1

-х= - 2

Х=2

(7х+1)-(9х+3)=5

7х+1-9х-3=5

-2х=5-1+3

-2х=7

Х= - 3,5

3,4+2у=7(у-2,3)

3,4+2у=7у-16,1

2у-7у= - 16,1-3,4

-5у= - 19,5

У=3,9

0,2(7-2у)=2,3-0,3(у-6)

1,4-0,4у=2,3-0,3у+1,8

-0,4у+0,3у=2,3+1,8-1,4

-0,1у=2,7

У= - 27

4 votes Thanks 4

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