Pls explain how u divide that 1/0.1+1/0.2+1/0.3 i dont understand pls

To divide by a decimal, you can convert the decimal to a fraction or multiply the numerator and denominator by a power of 10 to make the denominator a whole number.

$$\frac{1}{0.1} = \frac{1}{\frac{1}{10}} = 1 \times \frac{10}{1} = 10$$

Alternatively, multiply numerator and denominator by 10:

$$\frac{1 \times 10}{0.1 \times 10} = \frac{10}{1} = 10$$

$$\frac{1}{0.2} = \frac{1}{\frac{2}{10}} = 1 \times \frac{10}{2} = 5$$

Alternatively, multiply numerator and denominator by 10:

$$\frac{1 \times 10}{0.2 \times 10} = \frac{10}{2} = 5$$

$$\frac{1}{0.3} = \frac{1}{\frac{3}{10}} = 1 \times \frac{10}{3} = 3.333...$$

Alternatively, multiply numerator and denominator by 10:

$$\frac{1 \times 10}{0.3 \times 10} = \frac{10}{3} \approx 3.3333$$

$$10 + 5 + 3.333... = 18.333...$$

So, the sum is $\text{18.333...}$.