Question

1)х+260=800-240 2)х+400=2500-800 3)380-х=310-130 4)800-х=100-300

Answer 1

1) х+260=560        2)х+400=1700             3)380-х=180           4)800-х=-200
    х=560-260            х=1700-400                 х=380-180              х=800-(-200)
    х=300                   х=1300                        х=200                     х=1000

Answer 2

Let's solve each of the equations step-by-step:

1. х + 260 = 800 - 240

First, let's simplify the right-hand side: 800 - 240 = 560

Now, the equation becomes: х + 260 = 560

Next, isolate х by subtracting 260 from both sides: х = 560 - 260

Simplify further: х = 300

So, the value of х in this equation is 300.

2. х + 400 = 2500 - 800

First, simplify the right-hand side: 2500 - 800 = 1700

Now, the equation becomes: х + 400 = 1700

Next, isolate х by subtracting 400 from both sides: х = 1700 - 400

Simplify further: х = 1300

So, the value of х in this equation is 1300.

3. 380 - х = 310 - 130

First, simplify the right-hand side: 310 - 130 = 180

Now, the equation becomes: 380 - х = 180

Next, isolate х by subtracting 380 from both sides: -х = 180 - 380

Simplify further: -х = -200

To solve for х, we'll divide both sides by -1 (or multiply by -1): х = 200

So, the value of х in this equation is 200.

4. 800 - х = 100 - 300

First, simplify the right-hand side: 100 - 300 = -200

Now, the equation becomes: 800 - х = -200

Next, isolate х by subtracting 800 from both sides: -х = -200 - 800

Simplify further: -х = -1000

To solve for х, we'll divide both sides by -1 (or multiply by -1): х = 1000

So, the value of х in this equation is 1000.