Question

Решите уравнения: (Х-2,5)*4 1/5 =6,3 3,5*(х+2 1/4)=14 (1 3/4+х):1,9=2,5 (7,1-х):3,6=1 1/2 Кто решит правильно поставлю лучший ответ кто напишет вот так 1) 2) 3) поставлю нарушение кто напишет вот так кошар мгаиов рыяряяынлл 47895у63рп НАРУШЕНИЕ БУДЕТ!!!!

Answer 1

1)(х-2,5)*4 1/5 =6,3
х-2,5=6,3:4,2
х-2,5=1,5
х=4
2)3,5*(х+2 1/4)=14
х+2 1/4=14:3,5
х+2 1/4=4
х=1 3/4
3)(1 3/4+х):1,9=2,5
1 3/4+х=5,75
х=4
4)7,1-x=1,5×3,6
7,1-x=5,4
X=7,1-5,4
X=1,7

Answer 2

1. (Х-2,5)*4 1/5 =6,3

First, we need to simplify the left-hand side of the equation by converting the mixed number 4 1/5 into an improper fraction:

4 1/5 = (4*5 + 1)/5 = 21/5

So, the equation becomes:

(Х-2,5)*21/5 =6,3

Multiplying both sides by 5/21, we get:

Х - 2.5 = 3

Adding 2.5 to both sides, we get:

Х = 5.5

Therefore, the solution is Х = 5.5.

2. 3,5*(х+2 1/4)=14

Again, we need to convert the mixed number 2 1/4 into an improper fraction:

2 1/4 = (2*4 + 1)/4 = 9/4

So, the equation becomes:

3.5*(х+9/4) = 14

Dividing both sides by 3.5, we get:

х + 9/4 = 4

Subtracting 9/4 from both sides, we get:

х = 4 - 9/4 = 7/4

Therefore, the solution is Х = 7/4 or 1.75.

3. (1 3/4+х):1,9=2,5

We start by multiplying both sides by 1.9 to eliminate the fraction:

1 3/4 + х = 2.5*1.9

1 3/4 + х = 4.75

Subtracting 1 3/4 from both sides, we get:

х = 3.0

Therefore, the solution is Х = 3.0.

4. (7,1-х):3,6=1 1/2

First, we need to convert the mixed number 1 1/2 into an improper fraction:

1 1/2 = (1*2 + 1)/2 = 3/2

So, the equation becomes:

(7.1 - х)/3.6 = 3/2

Multiplying both sides by 3.6, we get:

7.1 - х = 5.4

Subtracting 7.1 from both sides, we get:

-х = -1.7

Dividing both sides by -1, we get:

х = 1.7

Therefore, the solution is Х = 1.7.