Question

1)0,4(y-8)-0,7+0,3(y+4)2)(14n+21)(1 4/5-3/10n)=03)3,8-p/5,5=3,6-p/11;​

Answer 1

Ответ:

1)0,4у-3,2-0,7+0,3у+1,2

0,7у-2,7

2)14n+21=0

14/5-3/10n=0

n=-3/2

n=28/3

n1=-3/2,n2=28/3

3)19/5-2p/11=18/5-p/11

209-10p=198-5p

-10p+5p=198-209

-5p=-11

p= 11/5

ВРОДЕ ТАК НАДЕЮСЬ ПОМОГЛА

Answer 2

Let's solve the equations one by one:

1. 0.4(y - 8) - 0.7 + 0.3(y + 4)

First, we distribute the decimals: 0.4y - 3.2 - 0.7 + 0.3y + 1.2

Combine like terms: 0.4y + 0.3y - 3.2 - 0.7 + 1.2

Simplify: 0.7y - 3.9

So the expression becomes 0.7y - 3.9.

2. (14n + 21)(1 4/5 - 3/10n)

First, let's convert 1 4/5 to an improper fraction: 1 4/5 = (5 * 1 + 4) / 5 = 9/5

Now we distribute: (14n + 21)(9/5) - (14n + 21)(3/10n)

Multiply each term: (14n * 9/5) + (21 * 9/5) - (14n * 3/10n) - (21 * 3/10n)

Simplify: (126n/5) + (189/5) - (42/10) - (63/10n)

Combining like terms: (126n/5 - 63/10n) + (189/5 - 42/10)

Finding a common denominator: (252n/10 - 63/10n) + (378/10 - 42/10)

Combine like terms: (252n - 63n)/10 + (378 - 42)/10

Simplify: 189n/10 + 336/10

So the expression becomes (189n + 336)/10.

3. 3.8 - p/5.5 = 3.6 - p/11

First, let's get rid of the fractions by multiplying through by their common denominator, which is 11 * 5.5 = 60.5: (60.5 * 3.8) - (60.5 * p/5.5) = (60.5 * 3.6) - (60.5 * p/11)

Simplify: 229.9 - 11p = 217.8 - 5.5p

Now, let's isolate the variable terms: -11p + 5.5p = 217.8 - 229.9

Combine like terms: -5.5p = -12.1

Divide both sides by -5.5 to solve for p: p = -12.1 / -5.5

Simplify the fraction: p ≈ 2.2

So the solution to the equation is p ≈ 2.2.