Question

1) 9/4=18/x 2) -7+ x=4 4/5 3) 8-x=-5 7/8 4) 3x+5=8x-15

Answer 1

1) 4*18=9*х, х=4*18/9, х=8

2) х= 4 4/5 + 7 = 11 4/5, х=11 4/5

3) х-8=5 7/8, х=13 7/8

4)15+5=8х-3х, 5х=20, х=4

Answer 2

Пошаговое объяснение:

1) $\frac{9}{4} = \frac{18}{x}$

$x=\frac{4*18}{9}$,

x=8

2) x=  $4\frac{4}{5}$ + 7

$x=11\frac{4}{5}$,

3) х-8=$5\frac{7}{8}$,

$x=13\frac{7}{8}$

4)15+5=8x-3x,

5x=20,

x=4

Answer 3

Sure, I can help you solve these equations. Let's solve each one step by step:

1. $\frac{9}{4} = \frac{18}{x}$

To solve for $x$, cross-multiply:

$9x = 4 \times 18$

$9x = 72$

Now, divide both sides by 9:

$x = \frac{72}{9}$

$x = 8$

So, the solution for this equation is $x = 8$.

2. $-7 + x = \frac{4}{5}$

To solve for $x$, first add 7 to both sides:

$x = \frac{4}{5} + 7$

To add fractions, find a common denominator, which is 5 in this case:

$x = \frac{4 + 35}{5}$

$x = \frac{39}{5}$

So, the solution for this equation is $x = \frac{39}{5}$.

3. $8 - x = -\frac{5}{8}$

To solve for $x$, first subtract 8 from both sides:

$-x = -\frac{5}{8} - 8$

To subtract fractions, find a common denominator, which is 8 in this case:

$-x = -\frac{5 + 40}{8}$

$-x = -\frac{45}{8}$

Now, multiply both sides by -1 to solve for $x$:

$x = \frac{45}{8}$

So, the solution for this equation is $x = \frac{45}{8}$.

4. $3x + 5 = 8x - 15$

First, subtract $3x$ from both sides:

$5 = 5x - 15$

Now, add 15 to both sides:

$20 = 5x$

Divide both sides by 5 to solve for $x$:

$x = \frac{20}{5}$

$x = 4$

So, the solution for this equation is $x = 4$.

In summary:

1. $x = 8$
2. $x = \frac{39}{5}$
3. $x = \frac{45}{8}$
4. $x = 4$