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Express [tex]\( 0.34\dot{5} \)[/tex] as a common fraction [tex]\(\frac{a}{b}\)[/tex], where [tex]\(a, b \in \mathbb{Z}\)[/tex].

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Sagot :

To express [tex]\(0.34\dot{5}\)[/tex] as a common fraction, let's follow a step-by-step approach.

### Step 1: Define the repeating decimal
Let [tex]\( x = 0.34\dot{5} \)[/tex].

### Step 2: Set up equations to eliminate the repeating part
To eliminate the repeating decimal, we'll multiply [tex]\( x \)[/tex] by a power of 10 such that only the repeating part ends up after the decimal point.

Since the repeating part is [tex]\( 5 \)[/tex] (which is a single-digit repeat), multiply [tex]\( x \)[/tex] by [tex]\( 10^2 = 100 \)[/tex]:
[tex]\[ 100x = 34.55555\ldots \][/tex]

### Step 3: Subtract the original [tex]\( x \)[/tex] from this new equation
Next, we subtract the original [tex]\( x \)[/tex] from the equation above to get rid of the repeating decimal:
[tex]\[ 100x = 34.55555\ldots \][/tex]
[tex]\[ x = 0.34555\ldots \][/tex]
[tex]\[ (100x - x) = 34.55555\ldots - 0.34555\ldots \][/tex]
[tex]\[ 99x = 34.21 \][/tex]

### Step 4: Solve for [tex]\( x \)[/tex]
Now, solve for [tex]\( x \)[/tex] by dividing both sides by 99:
[tex]\[ x = \frac{34.21}{99} \][/tex]

### Step 5: Simplify the fraction
Simplify [tex]\(\frac{34.21}{99}\)[/tex]. However, we need to express it correctly by handling the decimal part [tex]\( 34.21 \)[/tex] (actually the non-repeating part was [tex]\( 34.21111... \)[/tex] similar to the previous method). Simplify it accurately.

Rewrite integer and decimal parts:
[tex]\( 34.21 = 34.2111111... = 34 + \frac{21}{100} \)[/tex] simplest form gives something accurate:
[tex]\[ (3421/100 ∼per previous multiple steps)... same concept: 3435/99)]: ### Step 6: Finding the greatest common divisor (GCD) Finally, simplifying \(\frac{3421}{99}\): Euclid’s algorithm for GCD accurately, yielding: Both reduced... correctly, So: = \frac{14}{45} So: \[ x = \frac{863}{285}\][/tex]

So:
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