Question

Х - 640= 921:3 Х:9=2007:9 Х*81=729:3

Answer 1

1) Х-640=921:3
Х-640=307
Х=307+640
Х=947
2) Х:9=2007:9
Х:9=223
Х=223×9
Х=2007
3) Х×81=729:3
Х×81=243
Х=243:81
Х=3

Answer 2

1)х-640=921:3
х-640=307
х=307+640
х=947
947-640=921:3
307=307
2)х:9=2007:9
х:9=223
х=223×9
х=2007
2007:9=2007:9
223=223
3)х×81=729:3
х×81=243
х=243:81
х=3
3×81=729:3
243=243

Answer 3

Let's solve these step by step:

1. $X - 640 = \frac{921}{3}$

To solve for $X$, add 640 to both sides of the equation and then multiply by 3:

$X = (921/3) + 640$

2. $\frac{X}{9} = \frac{2007}{9}$

In this case, since the denominators are the same, you can simply equate the numerators:

$X = 2007$

3. $X \times 81 = \frac{729}{3}$

First, simplify the right side of the equation:

$\frac{729}{3} = 243$

Now, divide both sides of the equation by 81 to find $X$:

$X = \frac{243}{81}$

Simplify the fraction if possible.