Question

(x-380)×50=2000 (x+8):70=4 640:25(25-x)=40 2700:(x-12)=90

Answer 1

Ответ:

Пошаговое объяснение:

(x-380)×50=2000

х-380=2000:50

х-380=40

х=40+380

х=420

(x+8):70=4

х+8=70*4

х+8=280

х=280-8

х=272

2700:(x-12)=90

90(х-12)=2700

х-12=2700:90

х-12=30

х=30+12

х=42

Answer 2

Ответ:

1)х=420

2)х=272

3)х=24,36

4)х=42

Пошаговое объяснение:

1) (x-380)×50=2000

50х-19000=2000

50х=2000+19000

50х=21000

х=21000\50

х=420

2) (x+8):70=4

умножаем обе стороны уравнения на 70

х+8=4*70

х+8=280

х=280-8

х=272

3) 640:25(25-x)=40

640\(625-25х)=40

Решаем методом пропорции

40*(625-25х)=640*1

25000-1000х=640

-1000х=640-25000

-1000х=-24360

х=24360\1000

х=24,36

4) 2700:(x-12)=90

Решаем методом пропорции

90*(х-12)=2700

90х-1080=2700

90х=2700+1080

90х=3780

х=3780\90

х=42

Answer 3

Let's solve each equation step by step:

1. (x - 380) × 50 = 2000

First, distribute the 50 on the left side:

50x - 50 × 380 = 2000

Now, simplify:

50x - 19000 = 2000

Next, isolate x by moving the constant term to the other side:

50x = 2000 + 19000 50x = 21000

Finally, divide both sides by 50 to find the value of x:

x = 21000 / 50 x = 420

So, the solution for the first equation is x = 420.

2. (x + 8) : 70 = 4

To solve this equation, first, multiply both sides by 70 to eliminate the division:

x + 8 = 4 × 70 x + 8 = 280

Now, isolate x by moving the constant term to the other side:

x = 280 - 8 x = 272

The solution for the second equation is x = 272.

3. 640 : 25(25 - x) = 40

Start by simplifying the left side of the equation:

640 / 25(25 - x) = 40

Now, multiply both sides by 25 to eliminate the division:

25(25 - x) = 640 / 40 25(25 - x) = 16

Next, divide both sides by 25:

25 - x = 16 / 25

Now, isolate x by moving the constant term to the other side:

x = 25 - 16 / 25

To make the calculation easier, convert 16/25 to a decimal:

x = 25 - 0.64 x = 24.36

The solution for the third equation is x = 24.36.

4. 2700 : (x - 12) = 90

To solve this equation, first, multiply both sides by (x - 12) to eliminate the division:

2700 = 90(x - 12)

Now, divide both sides by 90:

30 = x - 12

Next, isolate x by moving the constant term to the other side:

x = 30 + 12 x = 42

The solution for the fourth equation is x = 42.

To summarize:

1. x = 420
2. x = 272
3. x = 24.36
4. x = 42