Question

1) 878 - (457+x) = 239 2)7(123-4x):749 3)32-(x+1)=1 4)(57-x)-41,2=6,286 5)(7,2+x)=4,2=30, 996пж ответ​

Answer 1

Ответ:

1. 878 - (457+x) = 239

878 - 457 - x = 239

421-х=239

-х=239-451

-х=-182

х=182

2. 7(123-4х)/749

861-28х/749=0

861-28х=0

-28х=-861

х=123/4=30,75

3. 32-(х+1)=1

32-х-1=1

31-х=1

х=30

4.(57-х)-41,2=6,286

57-х-41,2=6,286

15,8-х=6,286

-х=6,286-15,8

х=9,514

5. (7,2+x)=4,2=30 (если вместо равно пред 4,2 знак деления, то)

(36/5)+х)) /(21/5)=30

(36+5х)/5))/(21/5)=30

(36+5х)/21=30

36+5х=630

5х=594

х= 594/5=118,8

Answer 2

Пошаговое объяснение:

878 - (457 + х) = 249

457 + х = 878 - 249

457 + х = 629

х = 629 - 457

х = 172

32 - (х + 1) = 1

х + 1 = 32 - 1

х + 1 = 31

х = 31 - 1

х = 30

(57 - х) - 41,2 = 6,286

57 - х = 6,286 + 41,2

57 - х = 47,486

х = 57 - 47,486

х = 9,514

Answer 3

Let's solve each equation step by step:

1. 878 - (457 + x) = 239

First, simplify the parentheses:

878 - 457 - x = 239

Combine like terms:

421 - x = 239

Next, isolate the variable x by subtracting 421 from both sides:

-x = 239 - 421

-x = -182

To solve for x, multiply both sides by -1 to get:

x = 182

Therefore, the solution to this equation is x = 182.

2. 7(123 - 4x) ÷ 749

First, simplify the expression within the parentheses:

7(123 - 4x) ÷ 749 = 861 - 28x ÷ 749

Next, divide 28x by 749:

861 - (28x ÷ 749)

To simplify further, divide 28x by 749:

861 - 0.0374x

So the final expression is:

861 - 0.0374x

Please note that the equation is incomplete since there is no equal sign or a specific value to solve for.

3. 32 - (x + 1) = 1

First, simplify the parentheses:

32 - x - 1 = 1

Combine like terms:

31 - x = 1

Next, isolate the variable x by subtracting 31 from both sides:

-x = 1 - 31

-x = -30

To solve for x, multiply both sides by -1:

x = 30

Therefore, the solution to this equation is x = 30.

4. (57 - x) - 41.2 = 6.286

First, simplify the expression within the parentheses:

57 - x - 41.2 = 6.286

Combine like terms:

15.8 - x = 6.286

Next, isolate the variable x by subtracting 15.8 from both sides:

-x = 6.286 - 15.8

-x = -9.514

To solve for x, multiply both sides by -1:

x = 9.514

Therefore, the solution to this equation is x ≈ 9.514.

5. (7.2 + x) = 4.2 * 30.996

First, multiply 4.2 by 30.996:

7.2 + x = 130.1832

Next, isolate the variable x by subtracting 7.2 from both sides:

x = 130.1832 - 7.2

x ≈ 122.9832

Therefore, the solution to this equation is x ≈ 122.9832.