Question

228+200÷Х=230 Х×9=720-90

Answer 1

228+200÷Х=230

200÷Х=230 -228

200÷Х=2

Х=200÷2

х=100

проверка

228+200÷100=230

Х×9=720-90

Х×9=630

х=630÷9

х=70

проверка

70×9=720-90

630=630

Answer 2

Let's solve the equations step by step:

1. 228 + 200 ÷ X = 230

To isolate X, we need to get rid of the addition and division first. We can do this by subtracting 228 from both sides of the equation:

228 + 200 ÷ X - 228 = 230 - 228

200 ÷ X = 2

Now, to isolate X, we'll multiply both sides by X:

X * (200 ÷ X) = X * 2

200 = 2X

Dividing both sides by 2, we find:

200 ÷ 2 = 2X ÷ 2

100 = X

Therefore, X = 100.

2. X * 9 = 720 - 90

First, let's simplify the right side of the equation:

720 - 90 = 630

Now we have:

X * 9 = 630

To solve for X, we divide both sides by 9:

X * 9 ÷ 9 = 630 ÷ 9

X = 70

Therefore, X = 70.

So, the solution to the given equations is X = 100 and X = 70.