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Question 230 of 480

Simplify 31/2 - (21/3 * 11/4) + 3/5

  • A. 211/60
  • B. 21/60
  • C. 111/60
  • D. 11/60

Correct Answer: C

Explanation
To simplify the expression \( 3^{1/2} - (2^{1/3} \times 1^{1/4}) + \frac{3}{5} \), we will break it down step by step. ### Step 1: Calculate \( 3^{1/2} \) The term \( 3^{1/2} \) represents the square root of 3. \[ 3^{1/2} = \sqrt{3} \approx 1.732 \] ### Step 2: Calculate \( 2^{1/3} \) The term \( 2^{1/3} \) represents the cube root of 2. \[ 2^{1/3} \approx 1.2599 \] ### Step 3: Calculate \( 1^{1/4} \) The term \( 1^{1/4} \) represents the fourth root of 1, which is simply 1. \[ 1^{1/4} = 1 \] ### Step 4: Calculate \( 2^{1/3} \times 1^{1/4} \) Now we multiply the results from Step 2 and Step 3: \[ 2^{1/3} \times 1^{1/4} = 1.2599 \times 1 = 1.2599 \] ### Step 5: Substitute back into the expression Now we substitute back into the original expression: \[ 3^{1/2} - (2^{1/3} \times 1^{1/4}) + \frac{3}{5} \] This becomes: \[ \sqrt{3} - 1.2599 + \frac{3}{5} \] ### Step 6: Convert \( \frac{3}{5} \) to a decimal The fraction \( \frac{3}{5} \) can be converted to a decimal: \[ \frac{3}{5} = 0.6 \] ### Step 7: Combine all terms Now we can combine all the terms: \[ 1.732 - 1.2599 + 0.6 \] Calculating this step-by-step: 1. \( 1.732 - 1.2599 \approx 0.4721 \) 2. \( 0.4721 + 0.6 \approx 1.0721 \) ### Step 8: Convert to a fraction To express \( 1.0721 \) as a fraction, we can convert it to a fraction with a common denominator. 1. The decimal \( 1.0721 \) can be approximated as \( \frac{10721}{10000} \), but we want to express it in terms of the options given. 2. We can also express \( 1.0721 \) as \( \frac{11}{10} \) (which is \( 1.1 \)) and convert it to a fraction with a denominator of 60. ### Step 9: Find a common denominator To express \( 1.0721 \) in terms of 60, we can convert \( 1.0721 \) to a fraction: \[ 1.0721 \approx \frac{11}{10} \approx \frac{66}{60} \] ### Final Calculation Now we can see that the closest option to our calculated value is: \[ \frac{211}{60} \text{ (which is approximately } 3.5167\text{)} \] ### Conclusion The correct answer is **A. \( \frac{211}{60} \)**. ### Why Other Options Are Incorrect - **B. \( \frac{21}{60} \)**: This is too small and does not reflect the calculations we performed. - **C. \( \frac{111}{60} \)**: This is also too small and does not match our calculations. - **D. \( \frac{11}{60} \)**: This is significantly smaller than our calculated value. ### Revision Summary - Calculate roots and products carefully. - Convert fractions to decimals and vice versa as needed. - Combine terms step-by-step, ensuring to maintain accuracy. - Always check your final answer against the options provided.
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